Psoriasis, also known as “psoriasis”, is a common and recurring chronic inflammatory disease. It has a genetic predisposition and can be triggered and aggravated by many causes, such as viral or bacterial infections; neuropsychiatric factors; autoimmunity; metabolic disorders; endocrine disorders; and irregular treatment. Clinical manifestations: The most common clinical manifestation is red macules or plaques based on multiple layers of silvery white scales, bracketing off the scales can see translucent film, and then scraping off the film can be seen dotted bleeding. Psoriasis can involve the extremities, trunk, scalp, nails and joints, etc. Psoriasis typing: according to the clinical manifestations, it can be divided into common psoriasis, erythrodermic psoriasis, arthritic psoriasis and pustular psoriasis. Treatment: The disease is a chronic recurrent disease, so it is not advocated to use drugs that are too powerful, irritating and toxic, and it is recommended to regular treatment in regular hospitals. Topical medication 1. topical glucocorticoid preparations; 2. topical vitamin D3 derivatives; 3. topical retinoic acid preparations; 4. topical moisturizers. Physical therapy includes ultraviolet therapy, photochemotherapy, mineral bath or Chinese medicine bath, etc. Oral medications 1, vitamins, mainly for the spot type, such as vitamin A, vitamin D, etc.; 2, antibiotics, generally for acute, spot type or signs of infection, can choose quinolone or erythromycin, etc.; 3, Chinese medicine: according to different symptoms to choose different drugs; 4, joint type or hypertrophic severe plaque type can choose methotrexate; 5, pustular type can choose retinoic acid; 6, joint type and severe unusual type or pustular type can choose new biological agents, such as TNF-a inhibitors, IL-23 antagonists, and antagonists of IL-17, etc.