Psoriasis is a long-lasting autoimmune disease which is characterized by patches of abnormal skin. These skin patches are typically red, itchy, and scaly.
The least common type of psoriasis, erythrodermic psoriasis can cover your entire body with a red, peeling rash that can itch or burn intensely.
The dead cells move quickly to the outer layer of your skin and build up, forming red patches covered in flaky, silver scales. The skin also turns red and inflamed. … The itch is caused by psoriasis scales, flakiness, and inflamed skin.