Folliculitis flare up whilst on antibiotics?

I've been on lymecycline 1x 408mg daily for two months, everything ok. My derm said for the third packet of antibiotics i should take one antibiotic once every two days, so i have another two months i'm on antibiotics. i would say roughly since starting this routine my folliculitis has flared up with pimples on my scalp and chest in particular. is it possible to still have it flare up whilst on antibiotics or is it maybe not bacterial after all? when the pustules were cultured staph was found, no fungi.