Ulcer

From Wikinfo

An ulcer - latin: ulcus - 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 or other causes)

References

• Adapted from the Wikipedia article, "Ulcer" http://en.wikipedia.org/wiki/Ulcer, used under the GNU Free Documentation License