https://www.twlskin.com/what-is-a-dermatologist/A dermatologist (skin specialist) is a qualified medical specialist who has obtained qualifications to specialise in the diagnosis, treatment and prevention of skin, nail and hair diseases. Dermatologists are trained in cosmetic skin problems and aesthetic procedures. Only doctors listed as dermatologists by the Ministry of Health are recognised dermatologists. Cosmetic lasers, treatments, botulinum toxin and filler injections were developed by dermatologists.