My family and i just found out my brother has skin cancer from a few moles he had on his body. He's had some skin grafts to remove it and luckily it hasn't spread. I don't no much at that sort of stuff, but i thought about my grandma. she had it as well when she was alive, and i think i have small mole on my shoulder. My sister has them all over her back. Could it be genetic? Should we get checked out?