This document summarizes key information about morphea from Fitzpatrick's Dermatology in General Medicine, 8th edition. Morphea is a self-limited or chronically relapsing autoimmune skin disorder that causes thickened, sclerotic skin. It occurs more commonly in females than males and can affect both children and adults. Common subtypes include linear, circumscribed, generalized, and pansclerotic morphea. Histopathology of morphea skin lesions shows thickened collagen fibers parallel to the epidermis. Morphea has been associated with arthritis and other systemic involvement. Autoantibodies frequently seen in morphea patients include ANA.