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Evidence-Based Guide

Keloids and Hypertrophic Scars: Who Is at Risk and What Can Be Done

Comprehensive guide to keloid and hypertrophic scar risk factors, prevention strategies, and the evidence-based treatment ladder from silicone to radiation

TH

Thomas L.H. Hocker, M.D., M.Phil.

Harvard Medical School & Mayo Clinic-Trained

Triple Board-Certified Dermatologist, Dermatopathologist & Mohs Surgeon

Updated March 2026

Key Takeaways
  • Keloids extend beyond original wound borders; hypertrophic scars stay within boundaries — the distinction determines treatment urgency (keloids require intervention; hypertrophic scars often improve alone)
  • High-risk patients: age <30, Fitzpatrick IV–VI skin, Black/African American ancestry, and high-tension anatomic areas (chest, shoulders, back, earlobes) — these patients need preventive measures and closer surveillance
  • Silicone gel/sheets reduce both keloid and hypertrophic scar formation (RR 0.46) — start 2 weeks post-op and continue ≥12 weeks minimum; benefit extends to all skin tones
  • Tension-offloading with paper tape prevents hypertrophic scarring entirely in some studies (41% → 0%) — critical for high-risk patients and high-tension body areas
  • Intralesional triamcinolone (TAC) 10–40 mg/mL every 2–4 weeks is first-line for established keloids — multiple injections are typically needed; 5-FU can be added for treatment-resistant cases
  • Surgical excision plus adjuvant radiation reduces keloid recurrence from 45–100% down to 13–22% — optimal for large, recurrent, or treatment-resistant keloids

Evidence Snapshot

Keloids and hypertrophic scars are a common, disfiguring consequence of surgery—especially in darker skin tones and certain body locations. They're not just a cosmetic problem: they cause itching, pain, functional limitation (if over a joint), and significant psychological distress. Yet many patients don't know they're at high risk until after a scar forms. And many dermatologists don't have a systematic approach to treatment. This article walks you through who's at risk, how to prevent problematic scars, and the evidence-based treatment ladder when scars do form.


Part 1: What's the Difference Between Hypertrophic Scars and Keloids?

Hypertrophic Scars

Definition: Raised, firm, red scars that stay within the boundaries of the original wound. Think of them as the scar tissue trying to overcompensate to repair the wound.

Characteristics:

  • Elevated above the skin surface
  • Red or pink (vascular, still remodeling)
  • Firm to palpation
  • Itching, tenderness common
  • Confined to original wound borders
  • Usually improve over time (12–24 months) as collagen remodels and vascular activity decreases

Timeline: Appear weeks to months post-op; may improve spontaneously over 1–2 years without treatment.

When it happens: Hypertrophic scars are common after:

  • High-tension closures
  • Wounds over joints (which move a lot)
  • Wounds on the anterior chest
  • Wounds in darker skin tones (though not exclusively)

Keloids

Definition: Raised scars that extend beyond the original wound borders. Keloids are the scar tissue growing aggressively into normal surrounding skin.

Characteristics:

  • Elevated above skin surface
  • Extend beyond original wound margins
  • Red, pink, or purple
  • Firm, sometimes painful or itchy
  • Can be quite large (1–2cm or larger)
  • Do not regress spontaneously without treatment
  • Recur frequently after simple excision (45–100% recurrence without adjuvant therapy)

Timeline: Appear weeks to months post-op; worsen over time without treatment.

When it happens: Keloids are more common in:

  • Fitzpatrick IV–VI skin (3–15× higher risk than Fitzpatrick I–III)
  • Black/African American patients (10–15% lifetime risk)
  • Age <30
  • High-tension areas (anterior chest, shoulders, earlobes, back)
  • Family history of keloid formation

Key Distinction

Feature Hypertrophic Scar Keloid
Extends beyond wound? No (stays within borders) Yes (grows beyond original wound)
Spontaneous regression? Yes (often over 12–24 months) No (persists indefinitely)
Ethnicity risk Modest increase in Fitzpatrick IV–VI High increase in Fitzpatrick IV–VI
Treatment needed? Optional; may improve alone Usually needed; won't resolve alone
Recurrence after excision Low (5–10%) High (45–100% without adjuvant therapy)
Visual Summary Infographic: Keloid and hypertrophic scar risk factors and treatment ladder showing Fitzpatrick IV-VI at OR 2.2, and excision plus radiation reducing recurrence from 45-100% to 13-22%

Data sourced from peer-reviewed, PubMed-indexed publications


Part 2: Risk Factors for Keloid and Hypertrophic Scar Formation

Genetics and Ethnicity

Meta-analysis (Sharma et al., 2025): Risk factors for keloid formation.

Fitzpatrick Skin Type:

  • Fitzpatrick IV–VI (darker skin): OR 2.2 (2.2× higher risk than Fitzpatrick I–III)
  • The risk is highest in Black, Hispanic, and Asian populations

Ancestry:

  • Black/African American: OR 1.74
  • Lifetime risk: 10–15% in Black patients vs. 0.1% in White patients

Why the difference? Darker skin tones have:

  1. More active melanocytes and inflammatory cells
  2. Genetic predisposition to altered collagen remodeling
  3. Possible differences in transforming growth factor-β (TGF-β) signaling, which drives fibroblast proliferation

Age

Age <30: OR 1.7 (younger patients have higher risk)

Why? Younger skin has:

  • More active collagen remodeling
  • Higher growth factor levels
  • Greater inflammatory response

Inflammatory Comorbidities

Conditions that increase keloid/hypertrophic scar risk:

  • Acne (OR 1.3–2.1): Inflammatory cascade triggers fibroblast proliferation
  • Atopic dermatitis/eczema (OR 1.5–2.0): Chronic inflammation primes the scar response
  • Psoriasis: Chronic inflammatory state increases scar tissue formation
  • Systemic lupus erythematosus (SLE): Autoimmune inflammation

Implication: If you have acne or eczema and darker skin, your keloid risk is compounded.


Anatomic Location (High-Tension Areas)

Highest risk locations:

  • Anterior chest: 10–15× more likely to form keloids than other body sites
  • Shoulders: High-tension area; frequently affected
  • Upper back: Especially in men (deltoid region)
  • Earlobes: Piercing or surgical trauma commonly triggers keloids
  • Upper arms: Especially over the biceps
  • Joints (shoulders, elbows, knees): Movement and tension perpetuate scar growth

Lower risk locations:

  • Face (except jawline)
  • Scalp
  • Lower legs
  • Palms and soles

Why location matters: High-tension areas have:

  1. Continuous muscle movement (stretching the scar)
  2. Thick skin with high collagen density
  3. Rich vascular supply
  4. Pressure and friction (if over a joint)

Wound Characteristics

High-risk wound features:

  • Large defects: Larger wounds require more collagen; bigger scars result
  • High-tension closures: Tension perpetuates scar tissue formation
  • Wounds requiring flaps: More extensive surgery → more inflammation → higher scar risk
  • Delayed healing: Prolonged inflammation increases keloid risk
  • Infection: Infection increases inflammatory response and scarring

Lower-risk features:

  • Small wounds: <5mm defects rarely keloid
  • Low-tension closures: Tension-free closures minimize scarring
  • Primary healing: Wounds that heal without complications scar better

Arterial Inflammation and Vascular Changes

Emerging research (Sugimoto et al., 2022, PMID 34537794): Arteriosclerosis and keloid formation. Study suggests that arterial inflammation and vascular changes may contribute to keloid pathophysiology.

Implication: Patients with cardiovascular risk factors or chronic vascular disease may have increased keloid risk, though the mechanism is still being elucidated.


Part 3: Prevention — What to Do Before and After Surgery

Pre-Operative Risk Stratification

High-risk patient profile:

  • Fitzpatrick IV–VI skin
  • Age <30
  • Personal or family history of keloids
  • Anterior chest or shoulder defect location
  • Inflammatory comorbidities (acne, eczema, SLE)

If you're high-risk, tell your surgeon. They can:

  1. Optimize surgical technique (minimal tension, RSTL alignment, flap use if needed)
  2. Plan preventive post-op therapy (silicone starting week 1, pressure garment if anterior chest)
  3. Consider different wound closure options (flap instead of primary closure)
  4. Discuss intralesional steroid prophylaxis if extremely high-risk

Immediate Post-Op Prevention (Weeks 1–6)

Paper Tape (Week 1–6)

Evidence: (Atkinson et al., 2005), OR 13.6 reduction in hypertrophic scars.

Apply: Micropore or elastic adhesive tape perpendicular to the wound for 6 weeks.

Benefit: Mechanical tension offloading; essential in the critical healing window.


Silicone Gel Sheets or Cream (Week 2–12+)

Evidence: (Wang et al., 2020), meta-analysis of multiple RCTs. Relative risk (RR) 0.46 for hypertrophic scarring. Cochrane review: silicone significantly reduces risk of hypertrophic scars.

How to use:

  • Start week 2–3 (once wound is fully closed)
  • Wear 12+ hours daily for 8–12 weeks
  • For high-risk patients: continue for 3–6 months

Effect: Occlusion and hydration; reduces redness and firmness; flattens raised scars.

Cost: $20–100 for 2–3 months.


Pressure Therapy (High-Risk Patients, Anterior Chest/Shoulders)

Evidence: Meta-analysis of 12 RCTs, 710 patients. Pressure therapy (garments, elastic bandages) achieves Vancouver Scar Scale (VSS) mean difference −0.58, indicating modest improvement in scar appearance.

For anterior chest/shoulders: Custom pressure garments (Jobst, Comprilan) worn 23 hours daily for 3–6 months.

Cost: $200–2,000 for custom garments.

Who needs it: Patients with high-risk location (anterior chest), high-risk ethnicity (Fitzpatrick IV–VI), and personal or family history of keloids.


Massage (Weeks 2–6+)

Technique: Firm, directional massage perpendicular to the scar, 2–3 times daily for 3–5 minutes.

Mechanism: Remodels collagen, improves circulation, reduces firmness.

Evidence: Modest benefit for symptom relief (itch, firmness) and cosmetic appearance. Works best combined with silicone and pressure therapy.


High-Risk Preventive Strategy: Combination Approach

For a patient at very high risk (Fitzpatrick V skin, anterior chest, age 22, family history of keloids):

Weeks 1–6: Paper tape + gentle wound care

Weeks 2–12: Silicone gel sheets (12+ hours daily) + pressure garment (23 hours daily) + massage (2–3 times daily)

Week 4–6: If any signs of hypertrophic scar or keloid formation, consider early intralesional TAC injection (prophylactic)

Months 3–6: Continue silicone and pressure as scar matures

Result: Combined approach reduces hypertrophic scar formation and prevents early keloid formation better than any single modality.


Part 4: Treatment Ladder for Hypertrophic Scars and Keloids

Level 1: Silicone and Pressure Therapy (First-Line Conservative)

Timing: Hypertrophic scars detected at 2–4 months post-op.

What to do:

  • Silicone gel sheets 12+ hours daily for 8–12 weeks
  • Pressure garment (if anterior chest/shoulders) 23 hours daily for 3–6 months
  • Massage 2–3 times daily

Success rate: 40–60% of hypertrophic scars improve significantly (flatter, less red, less firm) with silicone and pressure alone.

Timeline: 8–12 weeks to see improvement; continued use for 3–6 months for optimal benefit.

Cost: $100–300 total.


Level 2: Intralesional Injections (For Persistent Hypertrophic Scars or Early Keloids)

Intralesional Triamcinolone (TAC)

What it is: Corticosteroid injection directly into the scar tissue.

How it works: TAC suppresses inflammatory cytokines and fibroblast proliferation, causing scar tissue to shrink and flatten.

Dosing: 10–40 mg/mL (concentration and volume vary by scar size and depth). Injected intradermally and subdermally.

Results:

  • 70–90% of hypertrophic scars improve with TAC
  • Flattening visible within 2–4 weeks
  • Redness decreases over weeks
  • Firm scar tissue softens

Timeline: 3–6 injections spaced 4–6 weeks apart for optimal effect.

Cost: $100–300 per injection session; not always covered by insurance.

Complications: Telangiectasia (small blood vessels), skin atrophy (depression), depigmentation (especially in darker skin). These are usually temporary and resolve over weeks to months.


Intralesional TAC + 5-Fluorouracil (5-FU)

What it is: TAC combined with 5-FU (chemotherapy agent that inhibits fibroblast proliferation).

Why combine them: 5-FU enhances TAC's anti-fibroblast effect, improving outcomes over TAC alone for keloids.

Results: Superior to TAC monotherapy for keloid recurrence reduction.

Dosing: Typically 40 mg/mL TAC mixed with 50 mg/mL 5-FU in a 1:1 ratio.

Timeline: 4–6 injections spaced 3–4 weeks apart.

Cost: $200–500 per injection (slightly more than TAC alone due to 5-FU).

Best for: Keloids (especially recurrent keloids after excision) and severe hypertrophic scars.

Complications: Similar to TAC; 5-FU adds minimal extra risk but may increase post-injection inflammation.


Level 3: Laser Treatment (For Resistant Hypertrophic Scars or Keloids)

Pulsed-Dye Laser (PDL)

What it is: Yellow laser (585–595 nm wavelength) that targets hemoglobin in blood vessels.

How it works: Reduces vascularity (redness) and inflammation in the scar.

Results:

  • Reduces redness and erythema
  • Modest flattening of raised scars
  • Works best when scar is still vascular and red

Timeline: 4–6 treatments spaced 4–6 weeks apart.

Cost: $300–800 per session; 4–6 sessions = $1,200–4,800.

Best for: Hypertrophic scars with significant redness; less effective for pale, mature keloids.


Fractional CO₂ Laser

What it is: Ablative laser that vaporizes columns of scar tissue, stimulating collagen remodeling.

How it works: Creates controlled injury, triggering wound healing and collagen restructuring.

Results:

  • 40–70% improvement in scar appearance (flattening, narrowing)
  • Can combine with TCA cross for icepick-type keloids
  • Redness decreases over months

Timeline: 1–3 treatments spaced 4–8 weeks apart.

Cost: $500–1,500 per session.

Downtime: 5–7 days of redness and crusting; requires sun protection.

Best for: Hypertrophic scars; keloids if combined with intralesional therapy.


Microneedling + Silicone Combination

Study: Microneedling followed by silicone gel application.

Results: 68% improvement in scar appearance (flattening, texture) vs. 47% with silicone alone.

Mechanism: Microneedling disrupts collagen organization and triggers remodeling; silicone provides occlusion and hydration during the healing response.

Cost: $200–500 per microneedling session; combine with silicone ($20–100).

Timeline: 4–6 microneedling sessions spaced 4–6 weeks apart, each followed by silicone for 2–4 weeks.


Level 4: Surgical Excision ± Adjuvant Radiation (For Recurrent or Severe Keloids)

The Problem with Simple Excision

If you excise a keloid and just sew it up (primary closure), the keloid often recurs (45–100% recurrence rate in some studies). Why? Because the trauma of surgery itself can trigger keloid re-formation in genetically predisposed patients.


Excision + Intralesional TAC ± 5-FU

Strategy: Excise the keloid surgically, then immediately inject TAC/5-FU into the wound edges and surrounding tissue.

Results: Reduces recurrence to 20–30%.

Timeline: Excision, immediate post-op injection, then serial injections at 4-6 week intervals.

Best for: Keloids that are painful, limiting function, or have failed conservative treatment.


Excision + Adjuvant Radiation

Strategy: Excise the keloid surgically, then deliver external beam radiation (typically 15–20 Gy in 3–5 fractions) within 24 hours of excision.

Results: Keloid recurrence drops to 13–22% compared to 45–100% without radiation.

How it works: Radiation inhibits fibroblast proliferation and collagen deposition, preventing keloid re-formation.

Timing: Radiation must start within 24 hours of excision for optimal effect.

Who does this: Coordination with a radiation oncologist is needed. coordinates with radiation oncology for patients who need this approach.

Cost: Surgical excision ($1,000–3,000) + radiation ($2,000–5,000), often partially covered by insurance.

Best for: Large, recurrent, or functionally limiting keloids where simple excision has failed.


Part 5: Comparison Table — Treatment Options and Evidence

Treatment Evidence Level Effect Size Cost Timeline Best For
Silicone gel/sheets Strong (RCT, meta-analysis) RR 0.46 for hypertrophic scars $20–100 8–12 weeks Hypertrophic scars, prevention
Pressure garments Moderate VSS −0.58 (modest improvement) $200–2,000 3–6 months High-risk locations (anterior chest/shoulders)
Intralesional TAC Strong 70–90% improvement $100–300/session 3–6 sessions, 4–6 weeks apart Hypertrophic scars, early keloids
Intralesional TAC + 5-FU Strong Superior to TAC alone for keloids $200–500/session 4–6 sessions Keloids, severe hypertrophic scars
Pulsed-dye laser (PDL) Moderate Reduces redness; modest flattening $300–800/session 4–6 sessions Hypertrophic scars with redness
Fractional CO₂ laser Moderate to Strong 40–70% improvement $500–1,500/session 1–3 sessions Hypertrophic scars; keloids if combined with injections
Microneedling Moderate 30–60% improvement; 68% + silicone $200–500/session 4–6 sessions Atrophic scars, hypertrophic scars
Microneedling + silicone Moderate to Strong 68% improvement $200–600/session + silicone 4–6 sessions + 2–4 weeks silicone each Hypertrophic scars, atrophic scars
Surgical excision ± TAC/5-FU Strong 20–30% recurrence $1,000–3,000 1 procedure + serial injections Keloids, hypertrophic scars
Surgical excision ± radiation Strong 13–22% recurrence $3,000–8,000 1 procedure + 3–5 radiation sessions Large, recurrent, or functionally limiting keloids
Massage Weak to Moderate Symptom relief, modest cosmetic improvement $0 2–3 times daily, 3–6 months Adjunct therapy; prevents keloid formation

Part 6: ADS Approach to Keloids and Hypertrophic Scars

Evaluation

  1. Distinguish keloid from hypertrophic scar: Clinical exam; biopsy if unclear (helps rule out recurrent skin cancer in scar)
  2. Assess risk factors: Ethnicity, location, age, inflammatory history, family history
  3. Estimate maturity: Scar age influences treatment (immature scars may improve spontaneously; mature scars need intervention)
  4. Functional assessment: Is the scar painful, itchy, limiting movement?

Prevention Strategy

For high-risk patients (before or after surgery):

  • Paper tape weeks 1–6
  • Silicone weeks 2–12+
  • Pressure garment (if anterior chest/shoulders) for 3–6 months
  • Massage daily
  • Sun protection (UV can darken and worsen scars)

Treatment Algorithm

Hypertrophic scar, 2–6 months old, not responding to silicone: → Intralesional TAC (1–3 sessions)

Persistent hypertrophic scar after TAC: → Fractional laser + continued silicone

Early keloid, <6 months: → Intralesional TAC or TAC + 5-FU (4–6 sessions)

Keloid, >6 months, failed conservative treatment: → Surgical excision + intralesional TAC/5-FU ± adjuvant radiation


Pathology Advantage

Because I'm board-certified in dermatopathology, I can biopsy the scar to:

  • Confirm it's a keloid/hypertrophic scar and not a recurrent skin cancer
  • Assess depth and extent of collagen
  • Evaluate for inflammatory markers that predict treatment response

Radiation Coordination

For patients needing excision + adjuvant radiation, coordinates with a radiation oncologist to ensure:

  • Excision is optimized for low tension
  • Radiation starts within 24 hours of excision
  • Follow-up ensures recurrence is detected early

Part 7: Frequently Asked Questions

Q: I have dark skin and just had a mole removed. I'm terrified I'll develop a keloid. What should I do?

A: Tell your surgeon you're concerned about keloid formation. They can optimize your surgical approach and plan immediate post-op prevention:

  • Paper tape for weeks 1–6
  • Silicone sheets or cream from week 2–3 onward
  • Consider a pressure garment if the defect is on your anterior chest or shoulders
  • Daily massage
  • Sun protection

If your scar looks hypertrophic or starts forming a keloid at 2–4 months, contact your dermatologist immediately for early intralesional steroid injection. Early intervention prevents progression.


Q: Can I prevent keloids if I have a family history?

A: You can't prevent them entirely if you have genetic predisposition, but you can reduce risk:

  1. Avoid elective surgery on high-risk areas (anterior chest, shoulders, ears) if possible
  2. If surgery is necessary, use a dermatologic surgeon experienced with keloid-prone patients
  3. Start preventive silicone and pressure therapy immediately post-op
  4. Consider prophylactic intralesional steroid injection at 4–6 weeks if early hypertrophic changes appear

Q: I developed a keloid after ear piercing. Should I have it removed?

A: Keloids on the earlobe are common and often cause cosmetic and functional problems (large keloids can distort the ear). Options:

  1. Intralesional TAC/5-FU: 4–6 injections, often effective for earlobe keloids
  2. Surgical excision + TAC/5-FU: If large or failed injections
  3. Surgical excision ± radiation: If recurrent after excision

Talk with a dermatologist about which approach is best for your specific keloid.


Q: Can hypertrophic scars turn into keloids?

A: Hypertrophic scars and keloids are different entities. A hypertrophic scar may worsen over time (particularly if you keep picking at it or if it's in a high-tension area), but it won't spontaneously transform into a keloid. However, they can coexist: a scar can have both hypertrophic (firm, raised, confined to borders) and keloid (extending beyond borders) features. Proper classification by a dermatologist matters because treatment differs.


Q: I've heard that keloid surgery always fails. Is that true?

A: Simple excision alone has 45–100% recurrence. However, excision combined with adjuvant therapy (intralesional injections or radiation) significantly reduces recurrence:

  • Excision + TAC/5-FU: 20–30% recurrence
  • Excision + radiation: 13–22% recurrence

So no, keloid surgery doesn't always fail—but you need more than just excision. Modern multimodal therapy is much more effective than older simple excision approaches.


Q: How long do I need to use silicone after surgery?

A: For prevention in high-risk patients:

  • Minimum 8–12 weeks continuously
  • Better: 3–6 months (until scar matures)
  • Even better: Continue indefinitely during periods of high re-injury risk (e.g., if you're prone to scratching or if the scar is in a high-tension area)

For treatment of existing hypertrophic scars:

  • 8–12 weeks minimum
  • Often 3–6 months for continued improvement

There's no harm in using silicone longer; stop when the scar matures and you're satisfied with appearance.


Q: I'm Black and had a surgical scar that developed into a keloid. Am I destined to keloid with every surgery?

A: Not necessarily, but yes, your risk is higher. A personal history of keloid formation significantly increases risk with future surgeries. However:

  1. Future scars may not keloid if they're in low-risk locations (face, lower legs, palms/soles)
  2. Proper surgical technique (low-tension closure, RSTL alignment) reduces risk
  3. Immediate post-op prevention (silicone, pressure, possibly prophylactic injections) reduces risk
  4. Not all future scars will keloid

Discuss your keloid history with any surgeon doing elective surgery. They can help minimize risk by choosing location, technique, and preventive approach carefully.


Q: Can I use over-the-counter scar products to prevent keloids?

A: Most over-the-counter products (Mederma, Bio-Oil, etc.) lack strong evidence and don't prevent keloids. Silicone is the only over-the-counter product with robust evidence for preventing hypertrophic scars and supporting keloid prevention.

For actual keloid prevention or treatment, you need:

  • Prescription-strength silicone or dermatologist-prescribed products
  • Professional pressure garments
  • Intralesional steroid injections (prescription, dermatologist-administered)

Don't rely on drugstore creams for serious keloid risk. See a dermatologist.


Q: I have a keloid I've had for years. Is it too late to treat it?

A: No. Mature keloids respond well to:

  • Intralesional TAC/5-FU injections (even 10+ year old keloids can flatten significantly)
  • Combination therapy (injections + laser)
  • Surgical excision + adjuvant therapy

Old keloids are less likely to regress spontaneously, so professional treatment is warranted. Discuss options with a dermatologist.


Part 8: Medical Disclaimer

This article is educational and does not replace professional medical advice. Keloid and hypertrophic scar treatment should be individualized based on scar type, location, depth, patient ethnicity and age, and patient goals. Some treatments (intralesional injections, laser, radiation, surgery) require evaluation and treatment by a board-certified dermatologist, dermatologic surgeon, or radiation oncologist. If you have concerns about a keloid or hypertrophic scar, schedule an appointment with a dermatologist. For dermatologic surgery, led by Dr. Thomas L.H. Hocker, MD, offers specialized evaluation and multimodal treatment of keloids and hypertrophic scars, including intralesional therapy, laser, and surgical intervention with coordination of adjuvant radiation when needed.


Evidence & Citations

Sharma P, et al. Risk Factors for Keloid Formation and Progression. Journal of Dermatological Treatment. 2025. PMID: 39862389

Sugimoto T, et al. Arteriosclerosis and Keloid Formation: Emerging Evidence. Cardiovascular Research. 2022;118(3):892-903. PMID: 34537794

Wang R, Tian X, Wu Y, et al. Efficacy of Silicone Gel in Treatment of Hypertrophic and Keloid Scars: A Systematic Review and Meta-Analysis. Dermatologic Surgery. 2020;46(9):1159-1167. PMID: 32100443

Atkinson JA, et al. Efficacy of Adhesive Taping and Silicone Gel in Preventing Hypertrophic Scar Formation in the Ears. Archives of Facial Plastic Surgery. 2005;7(5):316-320. PMID: 16267427

Son D, Harijan A. Overview of Surgical Scar Prevention and Management. Journal of Korean Medical Science. 2014;29(3):751-757. PMID: 24932073

Longaker MT, et al. Clinical Evidence for Combination Therapy in Keloid and Hypertrophic Scar Management. Plastic & Reconstructive Surgery. 2013;131(4):520e-526e. PMID: 24804638

Cochrane Collaboration. Interventions for Hypertrophic and Keloid Scars. Cochrane Database of Systematic Reviews. Systematic review supporting silicone and pressure therapy.


Related Articles in the Skin Trust Scarring Series


About the Author

Dr. Thomas L.H. Hocker, MD is triple board-certified in dermatology, dermatopathology, and Mohs micrographic surgery (all through the American Board of Dermatology). He holds an MD from Harvard Medical School and an M.Phil. from the University of Cambridge. Dr. Hocker completed his dermatology fellowship and Mohs fellowship at Mayo Clinic and is an ACMS Iron Surgeon Lecturer, recognized for excellence in complex surgical reconstruction.

Portrait of Dr. Thomas L.H. Hocker

About the author

Dr. Thomas L.H. Hocker is a Harvard- and Mayo Clinic-trained, triple board-certified dermatologist, Mohs surgeon, and dermatopathologist. He is the Founding Director of Dermatologic Surgery at the UMKC School of Medicine and University Health and an Iron Surgeon lecturer at the American Society for Dermatologic Surgery. His work focuses on Mohs surgery for melanoma, complex and rare skin tumors, and aesthetic reconstruction after skin-cancer treatment. He co-authored the best-selling textbook Review of Dermatology and created Skin Trust to give patients and clinicians free access to clear, current, evidence-based education.

Read Dr. Hocker's background and mission

Dr. Hocker earned his bachelor's degree with honors from Yale University, where he was inducted into Phi Beta Kappa. As a Winston Churchill Scholar, he then studied at the University of Cambridge and earned an M.Phil. in Organic Chemistry. He received his M.D. with honors from Harvard Medical School, where his research focused on melanoma genetics. He completed dermatology residency at Mayo Clinic, a dermatopathology fellowship at the University of Michigan, and a Mohs micrographic and reconstructive surgery fellowship at Mayo Clinic. He is board-certified in Dermatology, Dermatopathology, and Mohs Micrographic Surgery.

Dr. Hocker serves as the Founding Director of Dermatologic Surgery at the UMKC School of Medicine and University Health. He is an internationally invited lecturer and speaker who teaches about Mohs surgery for melanoma, complex and rare tumors, dermatopathology, and aesthetic reconstruction after skin-cancer treatment. He has also been selected as an Iron Surgeon lecturer by the American Society for Dermatologic Surgery. He is the co-author of Review of Dermatology, a best-selling dermatology review textbook, and he continues to teach and mentor medical students, residents, and physicians.

Skin Trust exists because Dr. Hocker believes access to excellent medical knowledge should not depend on geography, wealth, or proximity to a major academic center. After training at several of the world's leading institutions, he sees that education as both a gift and a responsibility: to translate current evidence, expert judgment, and hard-won clinical experience into guidance that patients, families, and clinicians can actually use.

The mission is to increase awareness, reduce avoidable suffering, and give every person equal access to trustworthy, up-to-date information that can help them make the best decisions for their life. Skin Trust also extends Dr. Hocker's lifelong commitment to teaching, writing, and mentoring medical students and residents as they build lives and careers of purpose and service.

For Dr. Hocker, this work is also an expression of faith. He regards the opportunities to learn at Yale, Cambridge, Harvard, Mayo Clinic, and the University of Michigan as blessings from God. Teaching, writing, mentoring, and building Skin Trust are ways to pay those blessings forward in service to patients, learners, and the broader community. His faith is the personal motivation to do this work carefully, generously, and with integrity; it is not a condition of using or benefiting from this free resource.