Systemic sclerosis is an alteration in the collagen produced by an autoimmune disease.
A dermatologist is a doctor who specializes in diseases of the skin, hair, nails and mucous membranes.
The rheumatologist is the doctor who specializes in the diagnosis and treatment of diseases that affect the joints, muscles, tendons and bones.
The orthopedist is a doctor who specializes in the skeletal muscle system of the human body including bones, joints, ligaments, tendons, muscles and nerves.
Remember that for the proper selection of health professional that treats systemic sclerosis you must consider the nature, severity and symptoms you are presenting.