Hi there. A photograph would greatly help & should you prefer discretion, feel free to use our premier 'ask-a-specialist' feature. From your history, distribution & description of the rash & skin lesions, i would think that you suffer from either molluscum contagiosum
(which may or may not be classified as an STD depending n the site & modus
of aquisition) or pseudofolliculitis barbae (ingrown hais) or viral warts
(again may or may not be an STD). All these 3 conditions may bleed on 'popping' them. unprotected sex may suggest that you aquired them from your girlfriend or have passed them onto her. Please do get both of you'll looked at by a dermatologist
(you certainly) & perhaps these lesions can be easily treated using an electrocautery or hyfrecator
machine under local anaesthesia in an OPD setting! Cheers & Please do practice safe sex & get your partner/s treated as well.