WHAT IT IS: Keloid scarring refers to thick, enlarged scars which are bigger than the original wound. They can form following minor skin damage or even spontaneously. There is an overproduction of collagen but the exact mechanism for keloid scar formation is not understood. They are more common in people with dark skin.
HOW IT IS IDENTIFIED: Keloid scars are often raised and firm to touch. They may be skin coloured or darker than surrounding skin. They are hairless. They commonly occur on earlobes (following piercing), cheeks (shaving, acne), and upper chest. Massive keloids can be seen in the first image
Source: A Handbook Mind The Map, Clinical signs in Black and Brown Skin. Mukwende M, Tamony P, Turner M