How To Get Rid Of Painful Pimple On Inner Thigh?

Woke up this morning feeling like I might have a small pimple on my inner thigh more on top left leg/thigh. Well I didn't...Through out the day it started feeling like a bruise no bigger than a thumb. No bruise or discoloration to be found. Then as time went on got bigger and started hurting to touch my skin. The area now is as big as a bowling ball. Hurts on the inside and weird feeling my pants rubbing acrossed it. That feeling when someone scratches your back in one spot too many times over again. That weird feeling. And skin hurts.