Very painful.. TMI

I have these three lumps on my buttocks about a quarter of and inch away from my actual butthole. It started off as one small lump with a white head. It then grew under my skin to about the size of a cherry. It popped and some clear and light white colored stuff came out of it. Then it shrunk down a bit and started itching. The next day it seemed like it was getting better. The day after that two more bumps that looked like pimples showed up again next to the first one. So now I have a cluster of them. It hurts very badly to sit or wear underwear/pants. Anybody ever been through something similar?