Hi My Name Is Dan. I Got Something I Thought

Hi my name is Dan. I got something i thought was a pimple in my groin area. Right above the penis on left side. I popped it thinking thats what it was. I hot a lot of pus out of it. Now it is a huge, very painful lump. I use meth sometimes due to working crazy hours. Can that be the cause? And could i have given it to my girlfriend? We were having sex this evening, and i noticed she has one but there is no head on it.