Dermatology is a medical specialty that deals with diseases and other problems of the skin, hair and nails. Dermatologists diagnose and treat a range of conditions, including skin cancer, psoriasis, eczema, acne, hair loss, wrinkles, infections and other skin problems. They can also perform periodic skin examinations to detect serious conditions such as skin cancers early. Dermatologists can also perform aesthetic procedures, such as Botox, fillers and laser treatments.