Parapsoriasis By Shinjita Das, MD, Harvard Medical School Reviewed / Revised Aug 2021 | Modified Sep 2022 View Patient Education Symptoms and Signs Prognosis Diagnosis Treatment Key Points Topic Resources Small-Plaque Parapsoriasis Large-Plaque Parapsoriasis... Large-Plaque Parapsoriasis... Parapsoriasis refers to a group of skin diseases characterized by maculopapular or scaly lesions.