Dermatology distinguishes between the studies of the skin, hair, and nails. Dermatologists assess and monitor patients who are experiencing severe, life-threatening seizures on the outside of the body. Clinical dermatology is the promotion of medications for the full spectrum of skin, hair, and nail diseases. Extracorporeal photopheresis is one of the various therapies for dermatological issues offered by therapeutic dermatology. It is used to prevent cutaneous immune system lymphomas such mycosis and seizures.