A dermatologist and a plastic surgeon are both medical doctors, but they have different areas of specialization and training.

A dermatologist is a medical doctor who specializes in the diagnosis and treatment of skin, hair, and nail conditions. They complete an undergraduate degree, medical school, and a dermatology residency program. They are trained to diagnose and treat medical conditions of the skin, hair, and nails, and also perform cosmetic procedures such as laser treatments and chemical peels.

On the other hand, a plastic surgeon is a medical doctor who specializes in surgical procedures to repair or reshape the body and face. They complete an undergraduate degree, medical school, and a plastic surgery residency program. They are trained to perform a wide range of surgical procedures, including reconstruction after injury or disease, and cosmetic procedures such as facelifts, breast augmentation, and body contouring. They also have the ability to use some non-surgical procedures such as injectables, like Botox or fillers.

In summary, a dermatologist is a medical doctor who specializes in skin, hair, and nail conditions and performs cosmetic procedures, while a plastic surgeon is a medical doctor who specializes in surgical procedures to repair or reshape the body and face, and also performs some non-surgical cosmetic procedures.