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A variety of factors -- ranging from emotional stress and trauma to streptococcal infection -- can cause an episode of psoriasis. Recent research indicates that some abnormality in the immune system is the key cause of psoriasis.
It can pop up as a single patch or several, and can even affect your entire scalp. It can also spread to your forehead, the back of your neck, or behind your ears. You canât catch scalp psoriasis from another person. As with other types, we donât know what causes it. Doctors believe it comes from something wrong with your immune system that causes skin cells to grow too quickly and build up into patches. You may be more likely to get scalp psoriasis if it runs in your family.