how to treat scalp (it might be psorasis)?

Answer 1

What are your symptoms? psorasis and sebboriac dermatitis are similar. Look both up on the computer if you can't make it into a doc soon and compare the symptoms.
They make medicated shampoos that work well. Perscription strength even.
If it turns out to be sebboriac dermatits I suggest using Head & Shoulders Intensive Treatment (dark blue bottle).
I've had that condition since I was a child and nothing helped much til I found that head & shoulders. I hardly have any problems and haven't for years now.
Until you can get to a doctor to ask about it just research it.