Scalp psoriasis? Dermatitis?

Couple months ago I noticed a small little red rash on my hair line (second picture) Months later I started getting more little spots on my left side hair line, since then they all started growing and spreading. The spots don’t normally

look that red, they’re only red when I wash my hair. Normally after two days they start getting itchy and flaky. I’ve heard about scalp psoriasis but I want to hear your guys opinions before I go to a dermatologist. Can also be an allergic reaction to my shampoo and hair oil? I almost want to say after I started using a new brand (Mielle) was when I started developing the red spots.