Ok so I have this mole on my shoulder thats fairly big but not huge. It looks fairly normal--circular, een brown color, with a tinge of darker color in the middle.

Well it was bothering me when it rubbed up against my clothes or if i touched it, so I got some surgical scissors and ateempted to remove it myself. I got most of it off, but i didnt get the outer part of it. What bothers me is that the outer part looks like its 'drained out' and now i just see blothches of dark brown skin instead of the remainder of a mole. Could this be cancer? I'm really worried. Please help!