The most important thing is that it is a very stubborn skin disease that is very harmful to patients and should be treated in a timely manner. Some people who have this disease do not go to regular professional hospitals to receive treatment, but go to some small clinics or use prescriptions, which results in delaying the disease. This makes treatment more difficult. The clinical classification: The clinical symptoms of psoriasis are diverse and vary widely from patient to patient, with great differences in diagnostic criteria, treatment principles, and prognosis of the condition. To facilitate the description and differentiation of different conditions, the dermatological community has divided psoriasis into four main types: 1. Psoriasis vulgaris: It is the most common type, accounting for more than 97% of all patients with psoriasis. The skin lesions vary in size and shape and can involve any part of the skin and mucous membranes such as the mouth and genitalia, but are more common on the scalp, trunk and extremities. 2, pustular psoriasis: this type is rare, there are two major types of limited and generalized type, the incidence of about 0.69%. It is characterized by the occurrence of sterile pustules at the lesion site, itching or pain, and may be accompanied by the lesions of common psoriasis. 3, arthritic psoriasis: the incidence of this type is also about 0.69%, there is a psoriatic rash and with joint symptoms cool rheumatoid arthritis. The joint damage mostly occurs within a certain period of time after the psoriasis rash appears, or it may occur at the same time as the rash, and a few patients may have arthritic symptoms before the rash appears. 4. Erythrodermic psoriasis: It is also less common and accounts for about 1% of all psoriasis cases. It is characterized by inflammation, flushing, and swelling of the skin all over the body on top of psoriasis, and is an acute, severe type of psoriasis. Erythrodermic psoriasis can be transformed from other types due to improper treatment, or it can occur at the beginning. Causes: The onset of psoriasis is associated with infectious factors, immunity, genetics, mental, and pollution. Hazards of Psoriasis: Although psoriasis does not directly affect life, it has a direct impact on physical health and mental and physical health. The quality of the patient’s social existence is reduced as a direct result of the damaged image. The main cause of psoriasis is reactive oxygen species, which are harmful products of muscle metabolism that seep into the interstitial matrix of blood cells, leading to pollution of the internal environment of the muscle, changes in the pure quality of blood, blood heat, blood dryness, blood stasis, and excessive accumulation of stagnant obstruction leading to plague poisoning in the skin. Recurring attacks over the years, the course of the disease is prolonged for a long time, consuming the blood and hurting the essence, the skin loses nourishment, dry and itchy, hurting the mind and losing sleep, and destroying the body.