Board certified dermatologists are specialty trained physicians to diagnose and treat skin disease.  Several other providers treat the skin or advertise that they are skin specialists, but board certified dermatologists are trained in skin, hair, and nail diseases and treatment have completed 3 years of training in an accredited residency and passed a certifying examination in dermatology (not other medical specialties).  While others may state they have special training, board certified dermatologists are the skin experts.