Hypertrophic Scar & Hypertrophic Scarring: Causes, Prevention and Modern Treatment (UK Guide)

Even the most refined surgical technique cannot fully eliminate the body’s biological response to a wound. In a subset of patients, that response goes too far and produces a hypertrophic scar — a raised, red, often itchy or painful scar confined to the original incision. Understanding why it forms and how to prevent and treat it is one of the most important parts of modern aftercare.

What is a hypertrophic scar?

A hypertrophic scar is an abnormal but self-limited proliferation of dermal collagen along the line of a healed incision or wound. Unlike a keloid, it does not extend beyond the original wound borders and often improves slowly over 12–24 months. Clinically it appears raised, firm, pink-to-red, and may be itchy or tender.

Etiology: why hypertrophic scars form

Hypertrophic scarring is a multifactorial process driven by an exaggerated and prolonged inflammatory and fibroproliferative phase of wound healing. Key contributors include:

• Mechanical tension across the wound — the single strongest modifiable risk factor.
• Prolonged inflammation from infection, foreign material, hematoma, or delayed healing.
• Genetic predisposition — darker Fitzpatrick skin types (IV–VI) and personal/family history of abnormal scarring.
• Anatomical site — sternum, shoulders, deltoid, upper back, earlobes and jawline are higher-risk zones.
• Age and hormones — younger patients and pregnancy increase fibroblast activity.
• Cytokine imbalance — excess TGF-β1/β2 and reduced TGF-β3 drive collagen overproduction.
• Wound depth and technique — deep dermal injury, poor eversion, and reactive sutures worsen outcomes.

Aftercare: how to prevent hypertrophic scars after surgery

Prevention is far more effective than treatment. A structured aftercare protocol begins the day the dressing comes off and continues for at least 6 months.

1. Tension offloading

Paper tape or silicone tape applied across the incision for 12 weeks reduces shear forces and is one of the few interventions with Level I evidence. Avoid heavy lifting, stretching, and high-impact activity for the period advised by your surgeon.

2. Silicone therapy

Silicone gel or sheets applied 12–24 hours per day for at least 8–12 weeks hydrate the stratum corneum, downregulate fibroblast activity, and reduce scar height, redness and itch. This is the international gold-standard first-line preventive measure.

3. Sun protection

UV exposure causes hyperpigmentation that can become permanent. Use SPF 50+ on the scar for at least 12 months and physical cover (clothing, tape) whenever possible.

4. Pressure therapy

For high-risk sites or extensive incisions (e.g., body contouring, burns), compression garments at 15–25 mmHg for 23 hours/day for 6 months reduce hypertrophic scar formation.

5. Moisturization and gentle massage

Once the wound is fully epithelialized (usually 3 weeks), gentle scar massage with a bland emollient for 5–10 minutes twice daily improves pliability and reduces adhesions.

6. Infection and inflammation control

Treat any redness, drainage, or stitch reactions early. Prolonged inflammation is one of the strongest drivers of hypertrophy.

Treatment modalities for established hypertrophic scars

If a scar becomes raised, red, itchy, or painful despite good aftercare, escalate treatment early — the sooner therapy begins, the better the response.

Intralesional corticosteroid injections

Triamcinolone acetonide (10–40 mg/mL) every 4–6 weeks remains the workhorse therapy. It reduces fibroblast proliferation and collagen synthesis. Often combined with 5-fluorouracil (5-FU) to lower steroid-related atrophy and telangiectasia.

Laser therapy

• Pulsed-dye laser (585/595 nm) — first choice for red, vascular hypertrophic scars; reduces erythema and pruritus.
• Fractional ablative CO₂ or Er:YAG — remodels collagen, improves texture and pliability, ideal after 3–6 months of maturation.
• Combined laser + intralesional therapy (laser-assisted drug delivery) has become a powerful modern protocol.

Cryotherapy

Intralesional or contact cryotherapy can flatten small, focal hypertrophic scars; risk of hypopigmentation in darker skin types.

Microneedling and radiofrequency microneedling

Useful for atrophic-hypertrophic mixed scars and for improving texture once the scar has matured.

Topical and adjunct therapies

• Silicone gel — continued through treatment.
• Onion extract / heparin / allantoin gels — modest adjunct evidence.
• Imiquimod cream — selective use after excision in keloid-prone patients.

Surgical scar revision

Reserved for mature, refractory, or functionally limiting scars. Always combined with adjuvant therapy (silicone, steroid injections, pressure or low-dose superficial radiotherapy) to prevent recurrence — surgery alone has a high relapse rate.

Emerging options

Botulinum toxin to reduce wound tension, autologous fat grafting to soften fibrotic scars, and topical TGF-β3 modulators are promising areas of active research.

When to call your surgeon

• Scar becomes increasingly raised, red, or itchy after 6 weeks.
• New pain, drainage, or sudden widening.
• Restriction of joint movement or contracture.
• Significant cosmetic distress — early intervention has the best results.

Conclusion

Hypertrophic scarring is a biological response, not a surgical failure — but it is largely predictable and increasingly treatable. A disciplined aftercare protocol of tension offloading, silicone, sun protection, and early escalation to intralesional and laser therapy when needed delivers excellent long-term cosmetic outcomes for the vast majority of patients.

If you have a personal or family history of abnormal scarring, tell your surgeon before surgery — your aftercare plan should be customized from day one.