Since the skin is in constant contact with the external environment, it is an organ that is open to the formation of diseases. Due to frequent exposure to environmental factors, chemicals, allergens and similar stimulants in daily life, the emergence of dermatological disorders may be facilitated. It deals with the diagnosis and treatment of skin, hair, nails, body entrance doors (such as oral mucosa) and venereal diseases (sexually transmitted diseases). It is also called skin science.