Usually moles (nevus) are benign tumors of the skin. A nevus can transform itself into a malignant tumor (melanoma malignum). Signs of malignant transformations are: first time occurrence, imbalanced growth, pain and itching, local inflammation, bleeding, becoming thicker, and change of color. If you notice some of the signs mentioned above you must visit a dermatologist or plastic surgeon as soon as posibble.
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