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For other uses, see Ulcer (disambiguation).
Classification and external resources
Specialty Pathology

An ulcer is a discontinuity or break in a bodily membrane that impedes the organ of which that membrane is a part from continuing its normal functions. In pathology, "ulcer is the breach of the continuity of skin, epithelium or mucous membrane caused by sloughing out of inflammed necrotic tissue." Common forms of ulcers recognized in medicine include: