I keep getting these puss filled pimples on my crotch after I shave. help!?

I use rubbing alcohol after I shave and always use shaving cream before...I also have stopped shaving since they started appearing and more keep popping up. There are three of them.
Update: I am trying to figure two things...
(1) Why I am getting these?
(2) What should I do about them?
Update 2: It is NOT sexually related...no herpes on my razor! I use clean high quality razors face razors...
Update 3: I've been wearing cotton underwear my whole life and never had this problem
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