Yep draining things like boils really freaking hurts. It doesn't matter how much local anesthetic they put in there nothing can stifle that pain when that big SOB pops out after they have been cutting, pushing and pulling on stuff for a while.
I had one when I was playing football in college that developed on my right shoulder blade. I put it off until it was about the size of a 50 cent piece and then told the trainers...who told the team doctor...who whipped out his bag of goodies (scalpel, forceps, you name it he had it in the bag) in the training room and I did pass out after I screamed like a little girl about 2 minutes into it.