A keloid is a common type of scar caused by an excess of collagen in the skin during the healing process. Keloids are lumpy, ridged, or rounded, bumps on the skin that harden to a different texture than the surrounding skin. A keloid scar often rises after an injury, surgical wound, or skin condition has healed. Keloids aren't harmful and don't need treatment for health reasons. But if you find keloid scarring unattractive or undesirable, your dermatologist can discuss safe keloid removal options at your next appointment or consultation.