The mole edge may become irregular, and the colour may darken and appear uneven. The mole may itch, or feel uncomfortable. The mole thickens as cancer cells begin to invade the deeper skin layers. Bleeding and crusting of the mole may occur. Because malignant melanomas are usually due to too much sun exposure, the commonest site for a malignant melanoma to develop is on the legs, if you are a woman.
Men are more likely to have a melanoma on their backs.
But, melanomas can develop anywhere on the body, even on the soles of the feet, and under finger and toe nails. You should go and see your doctor if you have any mole or skin lump that is worrying you. In most cases, your funny mole will not be cancer at all, and will turn out to be perfectly normal. However, if you should develop a malignant melanoma, early diagnosis and removal of the mole is essential. If in doubt - get it checked.