The Ulcer reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Ulcer

An ulcer is an open sore of the skin or mucous membrane, often caused by an initial abrasion and generally maintained by infection.

Specific types:

• peptic ulcer (of the stomach or duodenum)
• mouth ulcer
• pressure ulcer (decubitus)
• crural ulcer (due to venous insufficiency)

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