B stands for border. A doctor should evaluate moles with jagged, irregular or scalloped edges. C means color. Usually moles are a uniform shade of brown. Mixed colors including red, black, brown or blue could signal a problem.
D stands for diameter.
Give special attention to moles larger than one quarter of an inch, or about the size of a pencil eraser. In addition to the four basics, anything that changes should be evaluated, Buhac said. There s also a misconception that melanoma is a raised bump, but it can be flat. Sometimes, early forms of skin cancer can be misinterpreted as eczema or acne. Any skin lesion that refuses to heal needs to be evaluated by a dermatologist.