Scleroderma is a chronic autoimmune disease characterized by a hardening or sclerosis in the skin or other organs. The localized type of the disease, known as "morphea", while disabling, tends not to be fatal. The systemic type or systemic sclerosis, the generalized type of the disease, can be fatal, as a result of heart, kidney, lung or intestinal damage. It is currently not fully understood what exactly causes this disease, although there are various theories.