Psoriasis is a common chronic relapsing inflammatory skin disease characterized by red papules or plaques covered with layers of silvery-white scales, which occur on the extensor sides of the limbs, scalp, and back. Severe lesions may be widespread throughout the body and may be characterized by hyperthermia, pustules, erythrodermic changes, and generalized arthropathy of all sizes. Psoriasis is an immune-mediated, chronic, recurrent, inflammatory, systemic disease induced by a combination of genetic and environmental factors. The exact cause of the disease has not been clarified, and there is no such thing as “blood poisoning” in Western medicine.