Many causes: Wounds are breaks in the skin caused by an external agent. Ulcers form from within an result from some form of internal cause such as vein disease, autoimmune disease, cancers, or another process in which the soft tissues are injured and/or die resulting in a loss of the overlying skin. Since there are so many causes, you should seek an expert opinion from a doctor who specializes in wound care.
Answered 5/7/2013
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