If you have a worrisome mole or other lesion, your primary-care provider will probably refer you to a dermatologist. The dermatologist will examine any moles in question and, in many cases, the entire skin surface.

• Any lesions that are difficult to identify, or are thought to be skin cancer, may then be checked.

• A sample of skin (biopsy) will be taken so that the suspicious area of skin can be examined under a microscope.

• A biopsy can almost always be done in the dermatologist’s office.

If a biopsy shows that you have malignant melanoma, you will probably undergo further testing to determine the extent of spread of the disease, if any. This may involve blood tests, a chest x-ray, and other tests as needed.