DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Pyoderma ulcer (black and yellow) on a 60-year-old man's shin. The black area is dead tissue. Pyoderma ulcers form in patients with the condition pyoderma gangrenosum. The ulcers most often form on the lower limbs, as here, and are thought to be due to problems with blood supply to the ulcerated area. For treatment of this patient, see M728/040.
Model release available. Property release not required.