belly button infected or rejected?

hello! I have had my belly button pierced for around a year I would say

However this whole time I have been struggling with it: my jeans constantly tug at it and lately it’s been hurting really bad. But it looks soo nasty, how can I know if my body’s rejecting it?

TMI PICTURE sorry for the hair but it’s bad I’m scared to get soap on it or cut around it