The borders of aggressive tumors are generally irregular, notched, or ragged. In contrast, the edges of non-malignant tumors are usually smooth and regular. Additionally, any change in the surface of a mole is a warning sign. Scaliness, oozing, bleeding, or the appearance of a lump or bump should be inspected, as should any redness or a new swelling beyond the border of the mole, or spread of pigment from the border of a spot into the surrounding skin.
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