Hi BB This could be a number of things, and likely antigen specific problem [genetics-sorry] Viral is one example, and sounds like you might have a problem with demodex mites.
This leads to certain hormonal issues--likely excessive. This could be affecting you microbial ecology. I would try and avoid sugar, and greasy food. Adjust your diet with healthy oils.
I'm no nutritionist, but I think certain dietary adjustments could benefit you. Shroom