Melanoma, the cancerous type of mole are irregular in shape, or have a rough edge, not round. They are generally darker in color but sometimes can be multicolored, They do not have hair growing from them, Any mole that changes shape or color should be looked at by a doctor.
A B C D abnormal boarders, change in color, diameter. if the mole is not the same on each side, the color has changed , the appearance is red or black, if it is bleeding, if the size has changed. these are all things to be concerned with but the best advice is WHEN IN DOUBT, CHECK IT OUT !!!!!!
I learned this in health litterally a week ago. Melanoma is a type of cancerous mole and the signs of melanoma is the irregular shape of the mole. So moles which aren't cancerous are almost perfectly round, while cancerous moles have weird mishaped edges.
Have a biopsy/scraping of the mole or just have it removed to be safe and then the Pathologist will tell you if it was cancer. Then also, you need to have a whole body check to make sure you are totally clear.
Make the appointment and get it checked by a dermotologist. He/She will check all other spots and moles on your skin too so you can be reassured. The irregular shape thing is not always the case. I had a melanoma mole that looked exactly like a pencil-top eraser - same size, shape and color. Others have black moles, etc. But they vary, so get it checked out.