The earliest sign that a keloid is forming is a scar that keeps growing beyond the edges of the original wound. Instead of flattening over time like a normal scar, the tissue thickens, rises above the skin’s surface, and starts spreading into surrounding skin that was never injured. This growth can begin within a few months of the initial injury, though some keloids don’t appear until a year or more later.
The First Signs to Watch For
Normal scars go through a phase where they look red, feel firm, and sit slightly raised. This is part of healing and usually resolves within a few months. A keloid announces itself differently. The scar doesn’t soften or shrink. Instead, it continues to thicken and may start to feel lumpy or rubbery under your fingers. The surface often becomes shiny and hairless.
Sensation is one of the most useful early clues. A forming keloid typically itches, sometimes intensely. You may also feel tenderness, discomfort, or a burning sensation just under the skin near the scar. These sensations often coincide with active growth, so if a scar that had been quiet suddenly starts itching or feeling sore weeks after the wound closed, that’s worth paying attention to.
Color changes also help distinguish a keloid in progress. Depending on your skin tone, the growing scar may appear pink, red, purplish, brown, or noticeably darker than the surrounding skin. Some keloids develop a darker ring around the edges with a lighter center. The color often deepens as the keloid matures.
Keloid vs. Normal Raised Scar
The single most important distinction is whether the scar stays within the boundaries of the original wound. A hypertrophic scar (the most common type of raised scar) can look alarming because it’s thick and red, but it stays confined to the area that was actually injured. It also tends to improve on its own over months to a couple of years.
A keloid, by contrast, spills beyond those borders. If you had a small cut on your chest and the scar tissue is now wider or longer than the cut ever was, that’s characteristic keloid behavior. Keloids also don’t regress on their own. They either stabilize at a certain size or keep growing slowly over time. This growth pattern is the defining feature that separates keloids from every other type of scar.
Where Keloids Are Most Likely to Form
Keloids favor the earlobes, shoulders, upper chest, and cheeks. These are high-tension areas where the skin is under constant stretch from everyday movement, which appears to drive the overproduction of scar tissue. Piercings (especially ear piercings), surgical incisions on the chest or shoulders, and even acne on the jawline or upper back are common triggers.
That said, keloids can develop anywhere skin is injured. Burns, vaccinations, insect bites, and tattoos have all been documented as starting points. Even minor injuries that you might not remember can occasionally produce a keloid in someone who is prone to them.
Who Is at Higher Risk
Keloid prevalence varies significantly across populations. Studies across four continents found self-reported rates of 11% in Ghana, 7% in England, 6% in Australia, and 2% in Canada. Country-level data shows even wider ranges, from under 0.1% in some populations to as high as 16% in parts of Central Africa. People with darker skin pigmentation are at substantially higher risk, and keloids tend to run in families.
If you’ve had one keloid before, your chances of developing another after a new injury are much higher. Age plays a role too. Keloids most commonly appear between puberty and age 30, when the body’s wound-healing response is most active.
What’s Happening Under the Skin
In a normal healing wound, the body produces collagen (the structural protein in skin) to close the gap, then gradually remodels and softens the scar. In a keloid, the cells responsible for producing collagen go into overdrive. They multiply faster than normal, and each cell individually pumps out more collagen than it should. The result is thick, dense bundles of collagen that keep accumulating long after the wound has closed.
What makes this process self-sustaining is that the stiffening scar tissue itself signals the surrounding cells to produce even more collagen. The rigid environment triggers nearby cells to migrate into the area, proliferate, and continue building scar tissue. This feedback loop is why keloids can grow for years and why they’re so difficult to treat once established.
Acting Early Makes a Difference
If you notice a scar thickening or spreading beyond the wound border, the sooner you address it, the better your options. The American Academy of Dermatology recommends applying silicone sheets or silicone gel to a wound as soon as it has scabbed over. Silicone helps regulate moisture and pressure across the healing skin, which can reduce excessive collagen production.
For ear piercings specifically, if the skin around the piercing starts to thicken, remove the earring immediately and replace it with a pressure earring. Pressure therapy compresses the developing scar tissue and can slow or prevent further growth.
Other practical prevention steps include protecting healing wounds from sun exposure (UV radiation can worsen discoloration and potentially stimulate excess scarring), treating acne early to prevent deep scars that could trigger keloids, and avoiding unnecessary skin procedures like piercings or tattoos in areas where you’ve had keloids before. If you’re prone to keloids and need surgery, mention your history to your surgeon beforehand so preventive measures can be planned.
When a Scar Needs a Closer Look
A dermatologist can usually diagnose a keloid just by examining the skin. There’s no blood test or imaging required. In rare cases where the growth looks unusual, a small skin biopsy may be taken to rule out other conditions, but this is uncommon. If your scar is growing, itching, causing pain, or has clearly extended past the original wound line, those are all reasonable reasons to get a professional evaluation. Established keloids are harder to treat than ones caught in early formation, so waiting to “see if it stops” often works against you.