Dermatology is the science of the skin, which is the largest organ in the human body. It is the branch of medicine that deals with the diagnosis and treatment of diseases related to the skin, hair, nails, and mucous membranes. Dermatologists are medical professionals who specialize in the diagnosis and treatment of skin conditions, including skin cancer, acne, psoriasis, eczema, and other skin disorders. They also provide cosmetic treatments such as laser hair removal, chemical peels, and Botox injections.