Stages of Healing Decubitus Ulcer: Upper left image demonstrates Stage 4 ulcer, with periosteum of bone visible at base of wound. Over the course of several months, wound slowly healed. Charlie Goldberg, M.D. - UCSD Catalog of Clinical Images #Clinical #Dermatology #Decubitus #Pressure #Ulcer #Stage4 #Healing #Stages #Photo #UCSDH