Definition: A lesion on the surface of the skin or a mucous surface, produced by the sloughing of inflammatory necrotic tissue.
coord IM with organ/dis precoord (IM) but note specific precoord ulcer terms; RODENT ULCER see CARCINOMA, BASAL CELL is available; stress ulcer: index under PEPTIC ULCER or specific (IM) + STRESS, PHYSIOLOGICAL or STRESS, PSYCHOLOGICAL (IM)
