In short. A hypertrophic scar is raised and red but stays within the boundary of the original wound, while a keloid grows beyond those margins into healthy skin and rarely regresses. The distinction drives treatment: keloid care aims at control over months and carries a real risk of recurrence.
Key points
- A hypertrophic scar stays inside the wound boundary; a keloid grows beyond it.
- Keloids rarely regress and recur after simple removal in a large proportion of cases.
- First-line care is non-surgical: silicone, pressure and intralesional injections over months.
- Surgery alone has the highest recurrence rate for true keloids.
- The realistic goal of keloid treatment is control, not cure.
How the two scars differ
Not all bad scars are the same disease. A hypertrophic scar is raised and red but stays within the boundaries of the original wound, and often flattens somewhat with time. A keloid grows beyond the wound margins into healthy skin, rarely regresses, and recurs after simple removal at rates reported between roughly half and nearly all cases. Confusing the two leads to treatment that fails, or makes things worse.
Why does the scar overgrow?
Both conditions arise from an exaggerated healing response in which collagen production outruns breakdown. Risk is higher with darker skin types, with wounds under tension or healing slowly, over the chest, shoulders, upper back, jawline, and earlobes, and in patients with a family history. Earlobe keloids after piercing are a classic presentation.
Who should be assessed?
Anyone with a scar that is thickening, itching, painful, or spreading deserves assessment, because early treatment is easier than late. Expectations must be calibrated first: the realistic goal of keloid treatment is control, flatter, softer, quieter, not cure. Patients unwilling to commit to months of combined therapy and follow-up are likely to be disappointed by any single intervention.
| Feature | Hypertrophic scar | Keloid | Why it changes the plan |
|---|---|---|---|
| Extent | Stays within the boundary of the original wound | Grows beyond the margins into healthy skin | The diagnosis itself depends on this |
| Natural course | Often flattens somewhat with time | Rarely regresses | One may settle and the other will not |
| First-line care | Silicone, pressure and intralesional injections | The same combination, as a course over months | Treatment starts without surgery |
| Role of surgery | Reserved for specific situations such as a scar with functional problems | Reserved for specific situations, then paired with adjuvant treatment | Excision is a component, not the whole plan |
| Realistic goal | Flatter and softer | Flatter, softer, quieter, not gone | What a clinic should promise |
| Follow-up | Long aftercare after surgery | At least a year after any keloid intervention | Recurrence is planned for, not feared |
What treatment is used first
First-line care is usually non-surgical: silicone gel or sheeting, pressure therapy where feasible, and intralesional injections of corticosteroid-class medication, sometimes combined with other scar-modulating agents, given as a course over months. Laser can reduce redness and thickness. Surgery alone has the highest recurrence rate for true keloids, so excision is reserved for specific situations, such as a pedunculated earlobe keloid or a scar with functional problems, and is then paired with injections, pressure, or in selected cases postoperative radiotherapy, which substantially lowers recurrence. Each layer of the combination exists because the layer before it was not enough on its own.
What can treatment achieve?
It can flatten and soften most hypertrophic scars substantially, and can control many keloids so they are quieter, smaller, and less symptomatic. It cannot guarantee that a keloid will never recur, restore normal skin texture and colour, or reliably make a large keloid vanish. Honest clinics talk about control and maintenance, not removal.
Risks and recurrence
Injection courses are spaced over weeks to months; improvement is gradual. Surgical sites heal like any scar revision, then enter the same long aftercare programme. Skin thinning, pigment lightening, and small visible vessels are recognised side effects of repeated injections and are weighed against the benefit. Recurrence is the central fact of keloid care and must be planned for, not feared. A plan should include what happens if the scar regrows, and long-term follow-up for at least a year after any keloid intervention is part of the treatment, not an optional extra.
Sources
- NICE: guidance on the assessment and management of scars
- American Academy of Dermatology: patient information on keloids and hypertrophic scars
- Cochrane Library: systematic reviews on keloid and hypertrophic scar treatment
Source links open each organisation's search results for the topic. Document-level confirmation is pending the reviewer's sign-off.
Internal links
Frequently asked questions
How does a keloid differ from a hypertrophic scar?
A hypertrophic scar stays inside the boundary of the original wound and often flattens with time. A keloid grows beyond those margins into healthy skin, rarely regresses on its own, and recurs after simple removal in a large proportion of cases.
Why is surgery alone avoided for a keloid?
Excision on its own carries the highest recurrence rate for true keloids, so it is reserved for specific situations such as a pedunculated earlobe keloid or one causing functional problems, and is then paired with injections, pressure, or radiotherapy.
Is the goal of keloid treatment a cure?
Control is the realistic goal: flatter, softer, and quieter, rather than gone. Improvement comes gradually over months of combined therapy, and long follow-up for at least a year afterwards is part of the treatment because recurrence is a known possibility.
Risks & Limitations
- Reconstruction is usually staged — more than one operation is normal, and the plan may change as healing progresses.
- Donor-site scarring and discomfort, including after rib cartilage harvest.
- Partial or complete failure of a flap or graft, which may require further surgery.
- Scars are permanent. They mature and fade but never disappear.
- Asymmetry and the inherent limits of matching a normal side.
- Altered sensation, numbness or weakness in the operated area.
- Contracture, which may need release procedures later.
- Final assessment is made at 6–12 months, and longer in growing children.
When to Seek Care
- A flap or graft that turns dark, cold, black or stops bleeding when pricked.
- Fever above 38 °C, or spreading redness, warmth or discharge around a wound.
- New or worsening pain, swelling or fluid leakage from the operative site.
- Bleeding that does not stop with gentle pressure.
- Any change in a reconstructed area that concerns you, however minor.
References & Further Reading
- American Society of Plastic Surgeons (ASPS) — reconstructive surgery guidance
- World Health Organization (WHO) — burn and trauma care resources
- Chinese Medical Association, Plastic Surgery Branch — clinical guidance
- Cochrane Library — systematic reviews in wound and reconstructive care
This page is patient education, not medical advice, and it does not cite individual studies. Discuss your own case with a qualified clinician. To arrange an assessment at Chongqing West District Hospital, see Contact & Consultation.