Parapsoriasis isn’t related to psoriasis, even though they have similar names. While they have some overlapping symptoms, they are two different conditions. Like psoriasis, parapsoriasis shows up on the skin as a patchy rash commonly referred to as plaques. To treat parapsoriasis, your doctor may prescribe a medication or recommend light therapy. In addition, moisturizers can alleviate some of the symptoms associated with parapsoriasis.