What Causes An Itchy Boil On The Penis After Intercourse?

Im not sure if this is drug withdrawl or sexual encounter related but lets start with the drugs.. ive been doing cocaine and smoking crack for the better part of a year now and just quit cold turkey 2 weeks ago now for a month ive been extremely itchy to the point of naking myself bleed (itch is only in legs/kneecaps/nether regions and affect of the drug or not.The sexual side is i was high and had intercourse all night with my girlfriend and during oral she accidently bit a few times followed by a lomg painful handjob in which i lost erection.. and for a while was incredibly hard to get back (a week or so before it was mostly functioning) and now the itch is extreme on my penis with red spots from the head down and the anus too exept it seems like that area has developed serious acne kind of idk... but it to is extremely itchy and a boil has formed too my penis has not fully regained the ability to fully erectify and its been about a month.. i took an std test and the results havent come back yet. Im a smoker and a social drinker and a religious coffee drinker what seems to be wrong with me?