It Has A Bumb On The Side Of It.

You can tell if your piercing is infected due to these factors
1.does it hurt.
2.is there any abnormal swelling
3.has any puss come from the lump/bump mentioned on your piercing

If so you may need to be administered to a GP to get it looked at who should probably give you a antiseptic cream to help the situation.

Hope this helps:

B.Mason