What Is Dermatofibrosarcoma Protuberans (DFSP)?

Dermatofibrosarcoma Protuberans (DFSP) is a type of cancer called soft-tissue sarcoma and is rare. It forms in the skin's deeper layers, typically on the torso but also on the arms, legs, head or neck. While it can grow and invade surrounding fat, muscle and bone if untreated, it rarely spreads (metastasizes) to other parts of the body.

While it has been diagnosed in patients of all ages, it most often appears in people who are 20 to 50. Experts are not yet clear what causes the disease.