HELP PIMPLE UNDER THE SKIN!!!!

So two days ago I felt a tiny bump on my face and yesterday It was SUPER noticeable and it hurt when ever I touched it! So when I got home I tried to pop it but nothing came out so I put some toothpaste on it to dry it out but if only burned the skin on top! So now it’s EVEN WORSE!!! My mom told me this morning that it’s an under the skin pimple and it might be because of my period. Does anyone know what I should do about this? PLEASE HELP!