Extensive erythematous infiltrative damage with flaking is known as erythroderma. Erythroderma, also known as exfoliative dermatitis, is a serious systemic disease and is generally considered to be the same disease as exfoliative dermatitis, the former being characterized by extensive and marked erythematous infiltrative damage with chaffing, while the latter is characterized by the presence of widespread edematous erythema with extensive exfoliation. Erythroderma, a rare but severe skin disease also known as exfoliative dermatitis, is characterized by diffuse erythematous swelling and flaking over the entire body or over a large area of skin. The typical manifestation of erythrodermatitis is diffuse skin flushing, infiltration, swelling, and flaking over the entire body, with lesions affecting more than 80% of the skin, but erythrodermatitis is not only manifested in the skin, but also in the mucous membranes, skin appendages, lymph nodes, and even internal organs. There are not many patients with erythrodermic psoriasis, and most of them have used hormones for the common type, which can occur at any age, but there are more middle-aged and old people, and more men than women. The acute onset of the rash is preceded by fever, chills, lethargy and other pre-reactions. The rash often starts with a small amount of erythema on the flexor side of the limbs or on the flexor surface of the joints, and then spreads rapidly to the whole body, showing extensive flushing, followed by a large amount of flaking. The scales on the head and face are thicker due to more sebum or infection, and may be attached to the hair, generally causing hair loss. The nails are hypertrophic, uneven, grayish-yellow, and eventually fall off. The pharynx and nasal mucosa may also be involved. It is often accompanied by enlarged lymph nodes.