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:
Ulcer (dermatology), a discontinuity of the skin or a break in the skin.Pressure ulcers, also known as bedsoresGenital ulcer, an ulcer located on the genital areaUlcerative dermatitis, a skin disorder associated with bacterial growth often initiated by self-traumaAnal fissure, A.K.A an ulcer or tear near the anus or within the rectumDiabetic foot ulcer, a major complication of the diabetic footCorneal ulcer, an inflammatory or infective condition of the corneaMouth ulcer, an open sore inside the mouth.Aphthous ulcer, a specific type of oral ulcer also known as a canker sorePeptic ulcer, a discontinuity of the gastrointestinal mucosa (stomach ulcer)Venous ulcer, a wound thought to occur due to improper functioning of valves in the veinsStress ulcer, located anywhere within the stomach and proximal duodenumUlcerative sarcoidosis, a cutaneous condition affecting people with sarcoidosisUlcerative lichen planus, a rare variant of lichen planusUlcerative colitis, a form of inflammatory bowel disease (IBD).Ulcerative disposition, a disorder or discomfort that causes severe abdominal distress, often associated with chronic gastritis