Dermatologist doctors are specialized in treating skin, hair, and nails and also perform the cosmetic procedure. If you face some problem with your facial skin or hair, then a dermatologist will help you get treated. Below are few skin conditions that dermatologists treat: skin cancer, moles and warts, fungal infections, rosacea, shingles, and poison ivy reactions. Dermatologists are often trained in cosmetic procedures, such as fillers, tattoo removal, and wrinkle treatment.