Final answer:
A dermatologist is a specialized physician that deals with conditions of the hair, skin, and nails, also performing cosmetic procedures and skin cancer screenings.
Step-by-step explanation:
The physician that deals with hair, skin, and nails is known as a dermatologist. Dermatologists are specialized medical doctors who diagnose and treat disorders related to the skin, hair, and nails. They undergo extensive medical education, which includes earning a medical degree and completing a residency program. Dermatologists in the United States also need to pass the USMLE, become licensed in their state, and achieve certification by the American Board of Dermatology.
Beyond diagnosing and managing skin diseases, dermatologists are also involved in cosmetic procedures like Botox injections, laser treatments, and dermal fillers to address skin aging. They play a crucial role in screening for skin cancer, advising on sun protection, and treating conditions exacerbated by sun exposure, such as certain types of skin cancers, allergic reactions, and other health issues manifested in the skin and nails.