Hi people I was reading some of your cases I think I might have this disease as well. I've had folliculitis for almost 2 years, not all the time straight but with 4 or 5 relapses.
I've treated it with trimetroprim sulfa and mupirocin ointment and it seems to work but the last time didn't work totally so I went to see a derm and he sent some products that got worse my scalp (coal-tar mainly); therefore I went to see another one who gave me desonide and ovale 200mg(ketoconazole) along with kelual ds since allegedly I didn't have folliculitis but dermatitis. I started using these things and the dermatitis seemed to vanish but suddenly I had another breakout of folliculitis so I stopped applying desonide and taking ovale 200 mg to take trimetroprim again.- I read that one of the possible side effects of applying desonide is folliculitis- I haven't started yet but I hope this time it disappears once for all. I'll post a picture so that you can tell me whether is PF or no.
PD: I did take Roaccutane but this illness came when I shaved my head. I wouldn't say isotretinoin provoked folliculitis or dermatitis.