 [ Symptoms ] i will get nervous and jittery my head itches and i cannot fall asleep before bed i wake up in the am with a rash this has happened several times and it takes weeks before the rash goes away my dermatolgist said it is inverse psyroissis is that possible [ Disease ] i think you mean psoriasis a common dermatological condition that can appear on any skin surface including the scalp i am not sure what the inverse part is but then again i am not a dermatologist so to address your question yes it is possible to have psoriasis on the scalp there are many different medications from steroid solutions to shampoos that can help and there are prescription and over the counter medications to control the itching give your dermatologist a call and ask for some help