Dermatology is the branch of medicine dealing with the skin, its structure, functions, and diseases. Dermatologists diagnose and treat a wide range of conditions, including acne, eczema, psoriasis, and skin cancer. They also perform cosmetic procedures to improve the appearance of the skin. Dermatology involves both medical and surgical aspects, requiring a deep understanding of the skin's biology and its interaction with the environment. Advances in dermatology have led to improved treatments and better outcomes for patients with skin conditions.