You picked at a healing cut, or maybe it’s the bump left behind from a new ear piercing, and now it’s raised, shiny, and won’t quit itching. Is that just your body doing normal repair work, or something that’s going to keep growing? Figuring out hypertrophic scars vs keloids — the two most common culprits behind raised, stubborn scarring — matters more than it seems, because although they look similar at first glance, they behave very differently, and mixing them up can mean months of the wrong treatment.
Quick answer: A hypertrophic scar is a raised, red scar that stays within the borders of the original wound and usually flattens over months to a couple of years. A keloid is a scar made of excess collagen that grows beyond the wound’s edges, rarely regresses on its own, and tends to recur even after it’s removed.
That single detail — does the scar stay inside the wound or spread past it — is the fastest way to sort the two, but it’s not the only difference, and it’s not always obvious early on.
How hypertrophic scars and keloids actually form
Any wound that goes deep enough to reach the dermis — the thicker layer under your top layer of skin — triggers collagen production to close the gap. Normally that collagen lays down, firms up over roughly six to nine months, then flattens and fades. Normal scars follow a cycle of matrix proliferation, stabilization, and maturation.
Hypertrophic scars follow that same cycle, just an exaggerated, longer version of it — too much collagen, laid down too fast, but the process still eventually resolves. On histological examination, hypertrophic scars tend to have collagen in a wavy, regular pattern, while keloids show no distinct pattern at all. Keloids don’t follow the normal healing arc — they skip the maturation phase entirely, which is why they don’t taper off the way a typical scar does.
Under the microscope, the two are genuinely different tissue. The clearest histologic marker is the presence of broad, hyalinized collagen bundles in keloids — a feature that simply isn’t there in hypertrophic scars. This isn’t cosmetic hair-splitting; it’s the reason the two conditions respond so differently to treatment.
Hypertrophic scar vs. keloid: side-by-side comparison
| Feature | Hypertrophic Scar | Keloid |
|---|---|---|
| Stays within original wound? | Yes | No — grows beyond the wound edges |
| Onset | Weeks after injury | Can appear weeks to months later, sometimes even without an obvious injury |
| Regresses over time? | Often, partially or fully | Rarely; tends to persist for years |
| Collagen pattern | Wavy, organized | Disorganized, thick hyalinized bundles |
| Recurrence after removal | Low | High — often regrows, sometimes larger |
| Genetic link | Not established | Yes — family history and certain HLA/blood-type associations reported |
| Most affected group | Any skin tone, any age | More frequent in Fitzpatrick skin types III–VI, typically ages 10–30 |
| Common sites | Anywhere under tension (joints, chest) | Ears, upper chest, shoulders, neck, upper back |
| Symptoms | Itching, occasional tenderness | Itching, pain, tenderness, can restrict movement |
Who’s more likely to get one
Hypertrophic scars are largely about mechanics: they’re prone to occur when there’s a lot of tension on a healing wound, so a cut across a joint or a poorly aligned surgical incision is a common setup. They show up in people of every skin tone and age group.
Keloids lean much more genetic. Studies have found keloid formation running in twins and across generations of the same family, pointing to a real hereditary component that hypertrophic scars don’t share. Keloids are self-reported in about 16% of Black individuals, and Chinese individuals are more likely to develop them than those of Indian or Malaysian descent, while white-skinned individuals and people with albinism are least affected. Certain HLA haplotypes and blood group A have also been linked to a higher genetic risk. Age matters too — keloids are most common between ages 10 and 30, while hypertrophic scars can form at any age.
Location plays a role for both, but especially keloids: the upper chest, shoulders, ears, and neck are particularly prone to them, which is exactly why that stubborn bump behind a new piercing so often turns out to be a keloid rather than simple scar tissue.
Symptoms to watch for
Both types can be itchy, tender, or sore to the touch, but the way they feel over time is telling. Hypertrophic scars are typically worst around two weeks to two months after the injury, then gradually calm down. Keloids, on the other hand, tend to stay red, itchy, and painful for months to years, and because they don’t respect the wound’s boundary, they can genuinely restrict movement if they form near a joint.
Quick takeaway: if a scar is still spreading outward, still painful, or still growing a year after the injury, that’s a keloid pattern — not typical healing.
How doctors diagnose which one you have
Most of the time, a dermatologist can tell the two apart just by looking and feeling — checking whether the raised tissue stays inside the original wound margin, how firm it is, and how long it’s been there. When it’s genuinely unclear, especially early on, a small skin biopsy settles it by examining the collagen structure directly, since that hyalinized-bundle pattern is unique to keloids. Diagnosis rarely needs imaging or blood work — this is a clinical and, occasionally, a histological call.
Treatment options — and why keloids are harder to treat
This is where the distinction really matters, because treating a keloid like a hypertrophic scar (or vice versa) wastes months.
For hypertrophic scars, first-line care is genuinely low-risk and often effective. Silicone gel or sheets remain the most consistently supported option for both preventing and treating hypertrophic scars early. In one often-cited dataset on silicone occlusive sheeting worn continuously for up to a year, 34% of patients saw excellent improvement, 37.5% saw moderate improvement, and about 28% saw little to no change — solid odds, though not universal. Compression garments and simple time also help, since many hypertrophic scars soften on their own within a year or two.
For keloids, monotherapy tends to underdeliver. Combining intralesional triamcinolone acetonide with 5-fluorouracil now provides a more practical, reliable treatment backbone than steroid injections alone, according to a 2026 narrative review of the recent trial literature. Adjunct options get matched to the scar itself: cryotherapy for thinner lesions, fractional CO2 laser for texture and thickness, and botulinum toxin A as an additional tool in select cases. For larger or resistant keloids, surgical removal is an option, but it carries a real catch — keloids tend to recur after excision, so surgery alone is rarely the whole plan. Pairing excision with superficial radiation therapy has shown the strongest results for reducing recurrence, and corticosteroid tape applied after surgery is another recurrence-prevention layer used in some countries.
A quick honest note: evidence quality varies by treatment. A 2021 Cochrane review of 13 studies covering 468 participants found only limited high-quality evidence for silicone sheeting’s effectiveness on hypertrophic scars — it helps many people, but it isn’t a guaranteed fix, and results take patience (often two to four months of consistent daily use).
Can you prevent a keloid, and will a hypertrophic scar go away on its own
Hypertrophic scars often do fade substantially on their own, especially with silicone gel and time, since they follow the same maturation process as a normal scar — just a slower, more exaggerated version of it.
Keloids are the opposite story: they rarely shrink without treatment and can keep growing for years. If you already know you’re keloid-prone — because of family history or a past keloid — the smartest move is prevention before the next wound even happens: avoiding elective piercings or cosmetic procedures in high-risk areas like the chest or earlobes, using silicone sheeting on any new surgical incision starting as soon as the wound closes, and telling your surgeon about your history so they can plan incision placement and post-op steroid tape accordingly.
One myth worth killing here: a keloid is not a sign of skin cancer, and it can’t turn into one. It’s an overgrowth of your own collagen, not abnormal or malignant cell growth — annoying and sometimes disfiguring, but not dangerous in that sense.
READ MORE: What Causes Diaper Rash? The Real Reasons Behind Every Type
When to see a dermatologist
See a dermatologist if a scar keeps growing past the edges of the original wound, stays painful or itchy well beyond a couple of months, restricts movement near a joint, or if you’re keloid-prone and facing an upcoming surgery or piercing. Early intervention — sometimes starting the same week a wound closes — gives silicone and steroid-based treatments a much better shot at working, and it’s far easier to prevent a keloid than to shrink one that’s already established.
FOR MORE HELPFUL GUIDES LIKE THIS, VISIT MABASEM’S HEALTH HUB AND EXPLORE MORE.
FAQs: Hypertrophic Scars vs. Keloids
What is the main difference between a keloid and a hypertrophic scar?
A hypertrophic scar stays within the boundaries of the original wound and often fades over time. A keloid grows beyond the wound’s edges, rarely shrinks on its own, and is more likely to come back after removal.
Can a hypertrophic scar turn into a keloid?
No. They’re biologically distinct from early on, with different collagen structure. A hypertrophic scar that’s slow to heal is not “becoming” a keloid — though the two can look similar in the first few weeks, which is why misdiagnosis happens.
Are keloids genetic?
Yes, more so than hypertrophic scars. Keloids run in families, appear more often in identical twins together, and are linked to certain HLA types and blood group A.
Who is most likely to get a keloid?
People with darker skin tones (Fitzpatrick types III–VI), those aged 10–30, and anyone with a family history of keloids. The ears, chest, shoulders, and neck are the highest-risk body sites.
How do you get rid of a keloid?
Common approaches include intralesional corticosteroid injections (often combined with 5-fluorouracil), silicone sheeting, cryotherapy, laser therapy, and surgical excision paired with radiation therapy or steroid tape to reduce recurrence. No single method works for everyone.
Why won’t my keloid go away?
Keloids don’t follow normal wound-healing shutdown signals, so they keep producing collagen indefinitely without treatment. That’s also why they tend to recur even after being surgically removed.
Can you prevent a keloid before it forms?
If you’re keloid-prone, avoiding unnecessary piercings or elective procedures on high-risk sites, and starting silicone gel treatment as soon as a wound closes, meaningfully lowers your risk.
Does a keloid mean I have skin cancer?
No. Keloids are an overgrowth of normal collagen, not cancerous cells. They’re benign, though they can be uncomfortable or cosmetically distressing.
