You seem to be getting recurrent folliculitis
which is due to bacterial infection.
Since you are getting repeated episodes of folliculitis, it is more likely that you are harbouring the bacteria that is staphylococcus
in your body folds.
so you need to apply bactroban
cream twice a day in your natal cleft, groins for a week every month for 3 months.these creams are not over the counter but you will need a prescription for it.