Dermatology (from Greek derma, "skin") is a branch of medicine dealing with the skin and its appendages (hair, nails, sweat glands etc). A medical doctor who specializes in dermatology is a dermatologist .

Dermatologists are physicians (medical doctors) specializing in the diagnosis and treatment of diseases and tumors of the skin and its appendages. There are medical and surgical sides to the specialty. Dermatologic surgeons practice skin cancer surgery (including Mohs' micrographic surgery), laser surgery, photodynamic therapy (PDT) and cosmetic procedures using botulinum toxin ('Botox'), soft tissue fillers, sclerotherapy and liposuction. Dermatopathologists interpret tissue under the microscope (histopathology). Pediatric dermatologists specialize in the diagnoses and treatment of skin disease in children. Immunodermatologists specialize in the diagnosis and management of skin diseases driven by an altered immune system including blistering (bullous) diseases like pemphigus. In addition, there are a wide range of congenital syndromes managed by dermatologists.

Dermatologic surgeons (sometimes referred to as "Dermasurgeons") are Board-certified dermatologists who are members of American Society for Dermatologic Surgery (ASDS), a professional medical organization founded in 1970.

source wikipedia