Is it psoriasis or just dry scalp?

I've noticed that since my hair has been thinning that my scalp has gotten very dry and itchy to the point where I scratch a lot. I get these little scabs from where I've scratched. I wash my hair daily with Biolage shampoo and conditioner. Is there a chance this could be psoiasis or could it just be dry scalp? Also, what could I do about it? Does using a blow dryer and certain styling aids aggrevate the scalp as well? And, does anyone know how to slow down the hair loss other than getting in enough protein? Thanks. Andrea

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