answer:I have a friend who got a belly piercing about a year ago and she says it still hurts when it gets hit. I asked her if it was normal, she says it is but I still think its a small infection that a few antibiotics will fix. Possibly you got the same issue, got a small infection making it take really long to heal. Recommend you go to the doctor just to get antibiotics. Hope this helps. P.s. if its an infection your lucky it didn’t get bad, some people get really bad infections because they don’t take care of there piercing when they first get them.