What should I ask to get the right treatment for this? (Photo)

I believe this is bacterial folliculitis and I’ve been dealing with it for a year now. I’ve made multiple dermatologists and used many different medications. Most derms said it’s seb derm and only a few say I have folliculitis. Why am I getting mixed opinions if they’re all looking at the same thing? I’ve tried anti fungals, antibiotics, topical steroids/antibiotics, and one derm wants to put me on an oral antihistamine. Can’t they take a sample and figure out exactly how to treat me? What do?