Psoriasis is a common skin condition that affects millions of people worldwide. This condition will produce itchy, red patches all over the body. Psoriasis has different categories depending on the appearance and location of the outbreaks. Plaque psoriasis is the most common. It produces red patches on the elbows, knees and back. Scalp psoriasis produces itchy flaky patches in the scalp. Inverse psoriasis in another type of psoriasis that can also be called the hidden psoriasis. Find out more about Inverse Psoriasis