Beard causes sores that look like Psoriasis?

My boyfriend's beard after only a few days of growth causes sores underneath that itch and look similar to psoriasis it only occurs under his beard and he's wondering what he can do about it and what might be the cause... and i obviously having never grown a beard have no clue. I suggested that dead skin and skin oils get stuck under there even when he washes his face and could be the cause but he won't listen to me lol
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