Dermatology is a branch of medicine that deals with the diagnosis and treatment of disorders of the skin, hair, nails, and mucous membranes. It involves the study of the structure, function, and diseases of the skin, as well as its appendages (hair, sweat glands, etc.). Dermatologists are medical professionals who specialize in this field and provide care for patients with a wide range of conditions such as acne, eczema, psoriasis, rosacea, warts, moles, skin cancer, and other diseases. They may use various treatments including medications, creams, laser therapy, or surgery to manage these conditions.