difficult time distinguishing between true bacterial folliculitis and ingrown hair-induced folliculitis (pseudofolliculitis)
I assume Tazorac cream and Evoclin foam have been tried?
I would try Cleocin solution, which will kill bacteria and dry up the area.
Other thoughts: the folliculitis shold be cultured to identify the culprit and to be sure it might not be a Candida folliculiti
Finally, a prolonged oral antibiotic such as Tetracycline might help, along with mupirocin ointment to the groin. The latter might help in case you are a staph carrier.