A dermatologist is a doctor who specializes in conditions involving the skin, hair, and nails. A dermatologist can identify and treat more than 3,000 conditions. These conditions include eczema, psoriasis, and skin cancer, among many others. Dermatologist talking with patient The skin is an incredible organ. It is your first line of defense against disease, protects your other organs, warms you up and cools you down, and sends messages about how healthy you are inside. Dermatologists are expert medical doctors and skin surgeons with the unique skills and experience to offer the best care for the organ that cares for you. Dermatologists have extensive training, going to school for 12 years or more to learn to diagnose and treat more than 3,000 diseases of the skin, hair, and nails as well as cosmetic concerns. Patients see dermatologists for issues that are much more than skin deep. Problems with their skin can harm patients’ sense of self-worth, create discomfort that can make everyday activities difficult, and, in some instances, threaten lives. A dermatologist is a medical doctor who specializes in treating the skin, hair, and nails. Dermatologists care for people of all ages, from newborns to seniors.