Necrobiosis lipoidica diabeticorum: A dull red raised area on the skin that evolves into a shiny scar with a violet border, most often on the shin. There is telangiectasia with blood vessels easily visible under the skin. The area be itchy and painful and crack open. Treatment may include whirlpool therapy, occlusive dressings, topical steroids, aspirin, and pentoxifylline.

Necrobiosis lipoidica diabeticorum (NLD) is a degenerative disease of the connective tissue in the skin. More than half of people with NLD have diabetes. Hence the name. Also known as necrobiosis lipoidica and as necrobiosis.