A hard, raised, irregularly shaped, itchy scar on the skin due to defective healing process in which excessive amounts of collagen (a tough, fibrous protein) are produced, often after a skin injury. Keloids can arise anywhere on the body, but the shoulder and breastbone are typical sites. Black people are affected more frequently than white people. After a number of months, the majority of keloids stop itching and flatten.
Injection of corticosteroid drugs into the keloid can lessen itchiness rapidly and create some shrinkage.