Pimple In My Sac Lower Body Question ( Down There ) :'(?

Lower Body Question ( Down There ) :'(? - pimple in my sac

I feel strange talking me, and I hope that it will not make other people sick, or something like that.
Ok here goes: (problem # 1) This morning, I felt a pain in my back area, so I decided to feel and I feel a bump under the skin and hurts like a button on a face. Does anyone know this? larger than a normal grain (between my buttcheeks) Y (Problem No. 2) While I was looking for a tumor, I found strange-looking black bag in my good and fear in the Butthole because I never felt before. Any help to find what it is to support me and leave me without worrying (or not sleep!) Thanks to all answers