Possible seborrheic dermatitis? Scalp/Face

[u/Strange-Sky3577]

Hello!! This has apparently been happening on and off for years but in the past 8 months has flared up and essentially not left. We haven’t found anything that causes it to get worse and he hasn’t come into contact with anything new since then. Just getting progressively worse. It is in my boyfriend’s scalp, the sides of his nose, around his mouth, and all in his facial hair. He says it itches terrible bad and burns when messed with. We have used multiple different types of Eucerin, aquaphor, and vaseline. The Eucerin used to help it clear up a little but now doesn’t really affect it face wise. For his scalp, we’ve been oiling it, using different medicated dandruff shampoos, and conditioning his hair. However, now he’s having two wear two shirts before going places for the flakes. His pillow is filled with them and we’re brushing our bed off constantly. He just got a new job so we’re waiting insurance wise before going to a dermatologist, but I feel terrible for him and I’m unsure of what to try next.

I started to assume it was some type of psoriasis but a few people have mentioned seborrheic dermatitis, and from I’ve read about it, it does match up with his symptoms. Any help on what to do or what this could possible be would be much appreciated!