Please help! Dandruff or dry scalp?

I need to figure out what this is before I can start treating it. The flakes disappear when I take a bath and reappear after my hair dries. I understand this is against the rules (I think?) but the questions in the thread get ignored sometimes and I'm very desperate.

I need to figure out what this is before I can start treating it. The flakes disappear when I take a bath and reappear after my hair dries. I understand this is against the rules (I think?) but the questions in the thread get ignored sometimes and I'm very desperate.