Rejection is when your body treats your jewelry as an irritant and decides to push it out, or “reject” it. (This is the same way your body deals with a splinter or glass shard embedded in the skin.) With surface piercings, the warning signs are a thinning of the tissue around the posts, with the skin becoming red, shiny, or calloused—especially toward the center between the exit points. If the jewelry is close enough to the surface you may actually be able to see the jewelry through the skin.
If you think your piercing is rejecting, see your piercer immediately. Waiting too long to remove the jewelry can make skin discoloration and scarring even more severe. And if in doubt, stop by the shop anyway; one of our piercers can take a look at it and see if it needs to be removed.