My belly on piercing has like a boyle/ or something on the inside..HELP?

Okay. So the other day, i was looking at my belly on piercing, i got it done about 2 months ago, and i had like a boyle, or a pimple in the inside of my belly on, like right under the bottom ring. It kinda had a white head on the tip. So i popped it, and like tons of yellow pus came out. It was kinda nasty, but now it has pus come out of it whenever, or clear stuff. Whats wrong with it, or what can i do? Please help(: thankyou.