incumbent. adj. 1. (often: postpositive and foll by on or upon and an infinitive) morally binding or necessary; obligatory: it is incumbent on me to attend.
Morphea, also known as localized scleroderma, is a condition which causes hardening and discoloration of the skin. It is thought to be isolated to the skin without internal organ involvement as seen in systemic sclerosis (commonly known as scleroderma).
The cause of morphea is unknown, but it is thought that the collagen-producing cells become overactive and overproduce collagen. This can result in areas of sclerosis or skin hardening. Researchers are trying to determine what triggers the disease and whether it is genetic in origin.