A skin cancer tumors that starts in cells called melanocytes that may develop together to create benign (perhaps not cancerous) moles. A change in size, form, or color of a mole can be an indication of melanoma. It can be cured if detected early, before spread (metastasis) to many other places. Diagnosis is verified by a biopsy of this irregular skin. Sun publicity could cause skin surface damage that may cause melanoma.