Dermatology is the branch of medicine dealing with the skin. It is a specialty with both medical and surgical aspects. A dermatologist is a specialist medical doctor who has undergone advanced training (typically 4 years beyond medical school) and manages diseases related to skin. Dermatological conditions, including inflammatory diseases, infections, cancers, hair loss, and cosmetic issues are common in the population, and sometimes difficult to diagnose or treat, requiring the services of a dermatologist. Dermatological interventions include systemic and topical medications, surgery, radiation, and physical modalities such as cryosurgery or laser therapy.