The concern of dermatology is the study and treatment of SKIN conditions. It is a branch of medicine that focuses on the diagnosis, prevention, 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 diseases. They are trained to diagnose and treat a wide range of SKIN conditions, from common SKIN rashes to more serious SKIN diseases such as melanoma.