Last week I noticed that my belly button was really sensitive around the sides, but showed no others signs of problems. I left it alone until today when I gently probed the edges to see if it still hurt. It didn't, so I stretched it open a little and checked it for what may have caused the problem before. Now, an hour later, it's bright red and the edges feel like open wounds, but there's no sign of a wound. There's also no swelling, the red doesn't extent past my belly button and it doesn't hurt unless I actually touch two points on either side. Those are also the reddest parts of it. What exactly is this? Should I go see a doctor?