Seborrhoeic Dermatitis is what I believe it to be. Before I ever used aas, I got the small irritative zits on the back of my head and scalp and this is what they diagnosed it as. Who knows if they were right... this was about a decade ago and the medicine they prescribed only helped a little bit. Minocycline I believe. Once- when I went for a follow up they suggested that next time it if it doesn't clear up maybe I should try Accutane. Now, I'll tell you what... and irritating break out of this can really be a pain and embarrassing especially if you have very short hair. Whenever I let my hair grow out past half an inch, it gets extremely irritated and oily...then I buzz my hair and Im depressed for two days cuz I can feel and see how bad it is. Then it clears up.
Test makes it flare...tren makes it horrible...proviron makes it bad..
Ironically, 20mg accutane did clear it up even when I was on the above.
It really sucks I cant just be do ne with it forever. And really, no matter how bad I think I have it, when I do a google image search, I am borderline horrified...cuz mine at its worst is nowhere near as bad as these poor people.