A raised scar after an injury has healed. A keloid is caused by an excess of a protein (collagen) in the skin during healing.

Keloids are often lumpy or ridged. The scar rises after an injury or condition has healed, such as a surgical incision or acne.

Keloids aren't harmful and don't need treatment. If a person finds them unattractive, a doctor can sometimes minimise the scars.

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