The evaluation of skin moles begins with a history and physical exam.

Physical findings in someone with a normal skin mole usually include:

• Color is tan, brown, or black
• Sharp borders
• Round or oval shape
• Less than 6 mm (1/4 inch) in diameter
• Symmetric: one side has the same shape as the other

Usually, tests are not necessary to make the diagnosis of a skin mole. However, tests may be required in order to decide if a skin mole has become a malignant melanoma.

Tests that may be used to evaluate a skin mole include:

• Skin biopsy