Schamberg disease

Schamberg Disease, (also known as "Progressive pigmentary dermatosis of Schamberg", "Purpura pigmentosa progressiva" (PPP), and "Schamberg's purpura") is a chronic discoloration of the skin found in people of all ages, usually affecting the legs. It slowly spreads throughout the body, and is most common in males. It is named after Jay Frank Schamberg, who described it in 1901.