A skin biopsy is an examination that is performed on a small portion of skin or tissue, in order to rule out or confirm the existence of malignant cells.
A dermatologist is a doctor who specializes in diseases of the skin, hair, nails and mucous membranes.
The oncologist at a doctor specialized in diagnosing and treating cancer.
Remember that for the proper selection of health professional that treats skin biopsy you must consider the nature, severity and symptoms you are presenting.