 [ Symptoms ] what is the proper way to apply sunscreen to the face [ Disease ] the only definite 100 way of determining if a skin lesion is a skin cancer or not is with a biopsy either the entire lesion  or a piece of the lesion is removed and analyzed by a pathology lab a skilled clinician like a dermatologist can give you a pretty good idea but a visual inspection can be wrong because of your family history of melanoma it would be wise to get it checked out