If you have a Skin Lesion then review by your GP or at a skin cancer clinic or dermatologist is warranted. If the doctor is concerned then they may suggest a biopsy, this is where some or all of the lesion is cut out and sent to the lab to be visualised under a microscope. The diagnosis is then made and treatment can be planned.
Some lesions are very typical of certain skin cancers and in these cases the doctor may recommend to excise the lesion without a prior biopsy being required.