keloid is a raised overgrowth of scar tissue that forms at the site of a healed skin injury. Unlike normal scars, which typically flatten and fade over time, keloids grow beyond the boundaries of the original wound and do not regress naturally.  Keloids form due to a dysfunction in the wound-healing process, where the body produces too much collagen (the protein that provides structure and strength to the skin) after an injury. The exact reasons are not fully understood.

Keloid treatment