In short. A keloid extends beyond the original wound and keeps growing. How it differs from a hypertrophic scar, why it recurs, and what treatment can achieve.
Key points
- A keloid that is removed surgically has a substantial chance of coming back, often larger than before.
- That is why treatment is planned as a course with follow-up, why surgery alone is rarely the whole plan, and why the honest expectation is control rather than cure.
- A patient who understands this judges the result differently and is less disappointed.
A keloid is a scar that does not know when to stop. Where an ordinary scar settles and a hypertrophic scar eventually flattens, a keloid extends beyond the boundary of the original wound into skin that was never injured, and it tends to keep growing. It is more likely on certain sites, particularly the chest, the shoulders and the jawline.
Telling it apart from a hypertrophic scar
The boundary is the test. A hypertrophic scar is raised and thickened but confined to the area of the original wound. A keloid spills over that boundary, and its shape often extends in claw-like projections beyond the incision. Keloids also tend to be more persistently itchy or painful, and they continue to grow over months and sometimes years rather than settling at a predictable point.
Why it happens
The scar tissue is laid down faster than it is broken down, and the process does not switch off when the wound has been repaired. Why that happens in one person and not another is not fully understood, and it depends on a combination of the individual's healing response, the site, the tension across the wound and the skin type. It is not a verdict on the operation that caused the wound.
Recurrence is the central fact of keloid treatment
A keloid that is removed surgically has a substantial chance of coming back, often larger than before. That is why treatment is planned as a course with follow-up, why surgery alone is rarely the whole plan, and why the honest expectation is control rather than cure. A patient who understands this judges the result differently and is less disappointed.
How it is treated
Treatment is chosen by size, site and history, and it is usually combined rather than single. Options used in practice include pressure and silicone-based approaches, injections that modify the scar's activity, treatments directed at the blood vessels within the scar, and surgery where the bulk or the position makes it necessary, followed by treatment to reduce the chance of recurrence. A course of treatment over months is normal, and the response is judged across that period rather than after one session.
What treatment can achieve
Flatter, softer, less itchy, less painful and less conspicuous. Complete and permanent disappearance is not a realistic goal, and a clinician who offers it is offering something that cannot be delivered. What is realistic is a scar that stops growing, becomes tolerable, and in many cases becomes considerably less noticeable.
Prevention where it matters
If you know you form keloids, say so before any operation or piercing. That history changes how a planned wound is closed, where incisions are placed, and what is done afterwards, and it is the single most useful thing you can tell a surgeon in advance.
Seek care rather than waiting if
- The scar keeps growing and is becoming painful, itchy or tight, or it is limiting movement.
- The scar becomes red, hot, swollen or discharges pus, or you develop a fever — contact your treating team now, and if the team cannot be reached go to the nearest emergency department.
- A lump develops within or beside the scar and does not settle — have it assessed in its own right.
Frequently asked questions
How do I know if it is a keloid rather than a hypertrophic scar?
The distinguishing feature is the boundary. A hypertrophic scar stays within the original wound; a keloid extends beyond it into skin that was never injured. Keloids also tend to keep growing over time rather than settling, and they are more likely to recur after treatment.
Can a keloid be cured?
It can be treated and it often improves substantially, but recurrence is common and no treatment can be guaranteed to prevent it. That is why keloid treatment is usually planned as a course with follow-up rather than as a single procedure, and why the honest expectation is control rather than cure.
Should a keloid be removed surgically?
Surgery alone carries a high chance of recurrence, so when it is used it is usually combined with other treatment. The plan depends on the size, the site and the history, and it is made with the expectation that follow-up will be needed.
Risks & Limitations
- Every operation leaves a scar. A scar is a normal result of healing, not a complication.
- A scar continues to change for twelve months or more, so its early appearance is not its final appearance.
- Hypertrophic scarring and keloid, in which a scar becomes raised, thickened, itchy or continues to grow.
- Infection, wound breakdown or a collection under the wound, any of which changes how a scar forms.
- Scar contracture, where a scar tightens and restricts movement or distorts a nearby structure.
- No treatment removes a scar. Treatment can change its width, height, colour, texture or tightness.
- Further surgery produces a new scar, which may heal better or worse than the one it replaced.
When to Seek Care
- Increasing pain, spreading redness, heat, swelling, pus or a fever from a wound — contact your treating team now, and if the team cannot be reached go to the nearest emergency department.
- A wound that opens, gapes or discharges fluid.
- A scar that keeps growing beyond the original wound, or that becomes painful or itchy months after healing.
- A scar that tightens and restricts movement, or that distorts a nearby feature.
- Breathlessness, chest pain or a swollen painful calf — seek emergency care immediately.
References & Further Reading
- American Academy of Dermatology (AAD) — scar and wound care information
- American Society of Plastic Surgeons (ASPS) — scar revision guidance
- National Health Commission of the People’s Republic of China — surgical site infection prevention
- Chongqing West District Hospital — Plastic Surgery & Aesthetics Medical Center
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.