HELP ME! THERES SOMETHING WRONG WITH MY BELLY BUTTON

Please please please tell me this is just some kind of rash of something... What is it!?!? See how it's red... It doesn't show too well on camera. It's red on the outer bit now as I was pulling it back - I put my finger in and it was wet so then a tissue and it came out a tad yellow and it smells a little. Wtf is wrong..