A keloid is a firm, raised scar that grows beyond the borders of the original wound. That single feature, spreading past where the injury actually was, is the most reliable way to tell a keloid apart from a normal scar or other types of raised scarring. If your scar stays within the boundaries of your cut, piercing, or surgical site, it’s likely something else. If it has slowly crept outward into surrounding skin, there’s a good chance you’re dealing with a keloid.
What a Keloid Looks and Feels Like
Keloids present as firm, rubbery nodules or raised plaques that project noticeably above the surrounding skin. They can be flesh-colored, reddish, or darker than your natural skin tone, and the color often shifts as the scar matures. Some keloids have a narrow base, creating a rounded, almost mushroom-like shape, while others spread into a wide, flat plaque. The texture is distinctly different from normal skin: dense, smooth, and sometimes shiny.
What surprises many people is how much a keloid can itch. Studies consistently find that the majority of people with keloids experience itching, with rates ranging from 67% to as high as 95% depending on the population studied. The itching often extends beyond the scar itself into the surrounding skin. Pain and tenderness are also common. Research has found signs of nerve fiber changes within keloid tissue, with compressed and thinned nerve fibers that can produce unusual sensations like heightened sensitivity to touch, warmth, or cold in and around the scar.
How Keloids Differ From Hypertrophic Scars
This is the distinction most people are really trying to make. Hypertrophic scars are also raised and firm, but they stay contained within the original wound edges. A keloid, by contrast, invades horizontally into skin that was never injured. That outward creep is the single most defining characteristic separating the two.
Timing matters too. Hypertrophic scars typically show up within four to eight weeks after a wound closes, grow for about six to eight months, then plateau and often partially flatten on their own over time. Keloids follow a very different pattern. They can appear anywhere from three months to several years after an injury, they rarely mature the way other scars do, and they don’t regress on their own. If your raised scar appeared months or years after the original injury and shows no signs of flattening, that timeline points toward a keloid.
Where Keloids Typically Form
Keloids favor certain areas of the body. The chest is the most common site: in a review of 1,000 keloid patients, 34% had keloids in the center of the chest. Other frequent locations include the shoulders and upper arms (17%), the upper back, the back of the neck, and the earlobes (9%). If your raised scar is on one of these sites, that increases the likelihood it’s a keloid. They’re less common on the face, scalp, palms, and soles of the feet.
The triggers are often surprisingly minor. Piercings (especially on the earlobes and cartilage), acne lesions, surgical incisions, burns, and vaccinations can all set off keloid formation. Some people report keloids developing after injuries so small they don’t even remember them, which can make the scar seem like it appeared out of nowhere.
Who Is More Likely to Get Keloids
Keloid risk varies significantly across ethnicities. A UK study of nearly 1,000 patients found excessive scarring rates of 2.4% in Black patients, 1.1% in Asian patients, and 0.4% in white patients. Global prevalence numbers tell a similar story: roughly 0.09% in England overall, but 8.5% in Kenya and 16% in what is now the Democratic Republic of Congo. If you have darker skin and a family history of keloids, your risk is meaningfully higher. Keloids also tend to develop most often between puberty and age 30, though they can form at any age.
How Keloids Are Diagnosed
Doctors diagnose keloids based on their appearance and your history. There’s no blood test or special scan. A dermatologist will look at the scar’s size relative to the original wound, check whether it extends beyond the injury site, and ask when it appeared and whether it’s still growing. In most cases, a visual examination is enough.
A skin biopsy is occasionally needed if the growth looks unusual, is growing rapidly, or doesn’t match the typical appearance of a keloid. This is mainly to rule out other conditions like certain skin tumors. But for the vast majority of keloids, a dermatologist can confirm the diagnosis just by examining it.
What Treatment Looks Like
Keloids don’t resolve on their own, so treatment focuses on flattening the scar, reducing symptoms, and preventing regrowth. The most common first-line approach is corticosteroid injections directly into the scar tissue. These are typically given two to three times per month for six months or longer, depending on the keloid’s size and location. The injections gradually soften and flatten the scar, though the process is slow and can be uncomfortable.
Pressure therapy is another option, particularly after surgical removal of a keloid. It involves wearing a custom-fitted garment over the area for at least 23 hours a day at a specific pressure level, maintained for six to 24 months. This is most practical for keloids on the earlobes, where clip-on pressure devices can be worn relatively easily. For keloids on the chest or shoulders, sustained pressure therapy is harder to maintain but still used.
Surgical removal alone has a high recurrence rate, so it’s almost always combined with another treatment like corticosteroid injections, pressure therapy, or radiation to the site. The goal is to remove the bulk of the keloid and then prevent the scar tissue from rebuilding itself. Even with combination approaches, some keloids return, which is why ongoing monitoring matters after treatment.
Signs It’s Time for a Professional Evaluation
If your scar is growing beyond the edges of the original wound, hasn’t stopped expanding after several months, itches or hurts regularly, or appeared long after the injury healed, a dermatologist can give you a definitive answer. This is especially worth doing if you’re considering treatment, since early intervention tends to produce better outcomes than waiting until a keloid has grown large. Keloids on the earlobes from piercings, for instance, respond better to treatment when they’re still relatively small.