B is for border. If the mole s color has leaked out around the border, and the border is ragged or asymmetrical, this indicates increased risk of malignancy. C is for color. Two or more colors in a mole indicate likelihood of malignancy. If, when using a magnifying glass and bright light, one sees reds, whites and blues in the mole, this is an almost certain diagnosis for melanoma.
D stands for diameter.
The larger the mole, the more likely it is malignant. The current recommendation is that, if the mole is larger than an eraserhead, it probably should be removed. A more subtle sign of possible malignancy exists if the tiny, etched Lines of Langerhorn that cover our skin do not continue across the mole. In non-malignant moles they will do so. If these lines stop at the mole s border and if this border is irregular, risk of malignancy is indicated.