I have a very small red kind of rash on one side of my forehead, it's been there for about 2 months and i don't know how to treat it. is it fungi?

Exam: it is impossible to diagnoses without at least a photo. 2 months suggests that you should see physician or specifically,a dermatologist. Do not treat this on your own.

Without seeing it, I: can't say, and it make need a scraping to confirm fungus. You can certainly try some OTC lamisil, (terbinafine) but if not gone, need to see dermatologist for diagnosis and treatment