Scalp psoriasis, Plaque psoriasis, Signs of psoriasis, Treatment for psoriasis, Psoriasis symptoms, Inverse psoriasis, Itchy skin, Flaky skin. Root Cause of Disease Inverse psoriasis is a disease that causes your skin cells to reproduce very quickly. It’s a type of psoriasis that appears in areas where your skin rubs against itself (skin folds), including: It…