I had a boil on my butt.
Well, it wasn't really my butt. It was right along where my panties hit toward that direction.
I noticed it bothering me one day and thought it was just from sitting and scooching around on my chair at work.
It was no pimple, trust me.
I soaked in a hot bath, put hot wash rags on it....
I ended up having to have antibiotics to clear it up.
Definitely keep up with the soaking.
There is also a product called Boil-Eze that will help draw things out, but depending on how "sensitive" the area is, I don't know if you'll want to try that.
As horrible as it sounds, you might need to get help draining it.
The boil I had was treacherous and I'd never had one in my life.
It wasn't just a pimple.
Go to the doctor if you need to because it might just keep getting worse unless you do.
Best of luck with that.