Keloids: Understanding Scar Tissue Overgrowth & Causes

The blood disease that causes scars to puff up is called keloids. Keloids are a type of scar that forms when there is an overgrowth of scar tissue. They are usually raised, red, and itchy, and can be painful. Keloids can occur anywhere on the body, but they are most common on the chest, back, shoulders, and earlobes.