I Recently Thought I Had A Boil On My Butt

I recently thought I had a boil on my butt but it wasn't coming to a head. I used drawing salve but nothing. On Sat morning when I woke up I had a pain going across the lower part of my butt cheek and it hurts to sit. A week ago I had a procedure that involved fixing a collapse stent in my left leg. They went in through the rights side and down the left leg. I got three stents. I don't know if this has anything to do with it.