How do you tell if a mole on your back is cancerous?

Biopsy and pathology: Your clinician may be able to look at the lesion, either by the naked eye or with the help of tools such as a dermatoscope, to see if the mole has worrisome features. Whether the mole has changed in size or color is important for your clinician to know. If there is persistent concern, the lesion should be conservatively but completely excised to be examined under a microscope by a pathologist.

Mole in back: Since they are in a location hard to follow you should get evaluated. Changes in color, shape, irregular borders, ulceration or symptoms should prompt a professional evaluation.