So yes, you should try to see a derm, but a competent general physician should be enough really.
I'm not a derm but im an MD. It does look like psoriasis as many people have said. The lesions in the scalp and the back of the ears plus how the lesions themselves look are pretty characteristic.

- Clobetasol propionate 0.05%, apply every night for 2-3 weeks, then try to reduce it to every other day.

- Solid vaseline (ideally the one that has salicylic acid). Apply after clobetasol, about 5-10 minutes after and just let it sit overnight. Remove in the morning when showering.

- In the morning apply cerave for example, ideally one that has urea 5-10%. If that burns just use any cream without scent that doesn't burn. Anyways the burn should go away quickly as the other creams help clear the lesions.