A keloid is a scar that doesn't know when to stop growing. When the skin is injured, cells grow back to fill in the gap. Somehow, they "know" when the scar tissue is even with the contour of the skin, at which point they stop multiplying.
When the cells keep on reproducing, the result is either an overgrown (hypertrophic) scar OR a keloid. A hypertrophic scar is a thick, raised, smooth area that is confined to the site of injury. It diminishes on its own over a period of time.
Many people feel that applying an asprin paste helps speed up this process. A keloid, by contrast, may extend beyond the site of injury. Keloids do not subside on their own.
A keloid looks shiny and is often dome-shaped. It can range in color from slightly pink to red. It feels hard and thick and is always raised above the surrounding skin.
Generally speaking they require removal by a doctor, but even then they are known to grow back after removal. More.
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