A keloid is a type of raised scar that occurs when the body overreacts to the healing of a wound. It's a benign growth of excessive scar tissue that extends beyond the boundaries of the original wound. Keloids can be smooth, shiny, and dome-shaped, and they can vary in color from pink to red to dark brown. They're often firm and rubbery to the touch.

Keloids can form anywhere on the body but are most common over the breastbone, on the earlobes, shoulders, and cheeks. They're more common in people with darker skin tones and tend to develop after an injury, such as a burn, surgical incision, piercing, or acne lesion.

Treatment options for keloids include corticosteroid injections, surgical removal, cryotherapy (freezing the scar tissue), laser therapy, silicone gel or sheets, and radiation therapy. However, keloids have a tendency to recur even after treatment.