Squamous cell carcinoma usually develops on the face, lips, mouth and the rims of the ears, and it makes up approximately 20 percent of all skin cancers. Melanoma, the most serious form of skin cancer, takes on a mole-like appearance. Melanoma can develop on any part of the body, and it has a tendency to spread. If it isn't even, it is asymmetrical. This could be a bad sign.
Irregular edges are more likely to indicate melanoma.
The presence of multiple colors can signal problems. The larger it is and the faster it has grown, the more you should be concerned. If any uncertainty still exists after asking and answering these questions, make an appointment with a physician. When dealing with any type of skin cancers, early detection is key. The earlier the skin cancer is identified, the better the chances are for curing it.