It's important to distinguish between moles and melanoma. The acronym ABCD is an easy way to remember how to distinguish if a suspicious skin lesion needs the attention of a healthcare provider. ABCD stands for:
Any growth on the skin that changes color, becomes larger, has a different shape, or undergoes any other change should be reported. Melanomas usually do not cause pain. However, more advanced tumors may itch, ooze, or bleed. In addition, moles may become lumpy or hard.