Psoriasis, commonly known as psoriasis, is a chronic inflammatory skin disease with a long course and a tendency to recur, in some cases almost for life. The onset of the disease is mainly in young and middle-aged people, and it has a greater impact on the physical health and mental condition of patients. So, what are the classifications of psoriasis? The following is an introduction to the classification and performance of psoriasis: 1. What is the performance of common psoriasis? Psoriasis vulgaris is the most common type clinically, the initial lesions are red pinheads or chestnut-sized papules, or slightly larger macules, later can gradually expand or fuse into patches, the surface is covered with multiple layers of silvery white scales, gently scrape off the surface scales, gradually reveal a layer of light red shiny translucent film, if the film is scraped off again, a small amount of blood spots, known as punctate bleeding phenomenon. The lesions can occur in all parts of the body, with the scalp, limbs and trunk being the most common, accompanied by itching of varying degrees. 2.What kind of performance does arthritic psoriasis have? Simply put, in addition to the rash of psoriasis, there are also joint lesions. The incidence of arthritis in patients with psoriasis is 6.8%. It is more common in men. It is an asymmetric peripheral arthritis of the small joints of the hands, wrists and feet, especially the terminal joints of the fingers (toes). Joint symptoms often decrease or worsen with skin damage, and the joints may be swollen and painful, with limited movement and deformity. On X-ray, the edges of the affected joints may be eroded, and in severe cases, there may be osteolysis or hypertrophic arthritic changes. Patients with severe arthritic psoriasis are often accompanied by high fever and increased blood sedimentation. 3.What kind of performance does pustular psoriasis have? This type of psoriasis is less common and is usually clinically divided into two types, namely, generalized pustular psoriasis and palmoplantar pustular psoriasis. Patients with generalized pustular psoriasis may have inflammatory erythema all over the body, and a large number of dense pinhead to chestnut-sized sterile pustules appear on the spots, which occur repeatedly and can appear in batches or one after another. The pustules often fuse and become lamellar pus lakes and keep expanding. They may be accompanied by systemic symptoms such as fever and lethargy. The skin lesions of palmoplantar pustular psoriasis are limited to the hands and feet, mostly occurring on the palms of both hands and the plantar areas of the feet. 4.What kind of performance does erythrodermic psoriasis have? This type of psoriasis is characterized by generalized redness, swelling and desquamation, and erythrodermic changes, mostly due to improper treatment or other reasons, so that common psoriasis or pustular psoriasis is transformed into erythrodermic disease. It is common that the disease is triggered by the application of highly irritating topical drugs during the progressive stage or by the sudden discontinuation of a large number of long-term oral hormones or certain immunosuppressive drugs, and the patient’s whole body is diffusely flushed and has a large amount of flaking. It is often accompanied by fever, chills and other general discomfort. Superficial lymph nodes are enlarged. During the course of the disease, a large number of scales are shed every day, and the loss of a large amount of protein will lead to hypoproteinemia, coupled with the patient’s skin expansion and congestion, heat dissipation quickly, so it is easy to occur colds, pneumonia and other comorbidities, causing adverse consequences. 5.What are the characteristics of psoriasis in children? According to a large amount of clinical data and statistics at home and abroad, the initial onset of psoriasis in children is mostly associated with infection, the onset of the disease is urgent, and the rash lesions are mostly characterized by droplets. Patients with acute punctate psoriasis often have a history of acute tonsillitis attacks before the onset of the disease. For recurrent tonsillitis, psoriasis can be improved or cured after removing the tonsils or giving antibiotic treatment. 6.What is the isomorphic reaction of psoriasis? If the skin is rubbed, injected, pricked or touched by trauma, or stimulated by other skin diseases, new psoriasis rashes can occur in the skin lesions or stimulated places, and this phenomenon is called isomorphic reaction. According to statistics, the incidence of isomorphic reaction phenomenon among psoriasis patients is 11%~75%. Generally speaking, the more serious and active the disease is, the greater the possibility of isomorphic reaction. Therefore, patients with progressive psoriasis should avoid scratching and trauma to prevent the occurrence of isomorphic reactions. 7.How is the process of development and regression of psoriasis vulgaris divided? Western medicine divides the whole process of psoriasis vulgaris into three phases – the progressive phase, the stable phase and the receding phase. In terms of the course of the disease, the general sequence of lesion regression is from the progressive phase to the stationary phase, which can be long or short and varies from person to person, and then to the receding phase to achieve clinical healing. In the progressive phase, new rashes appear continuously, old rashes continue to expand, adjacent lesions often fuse with each other, inflammation increases, scales thicken, itching, and isomorphic reactions; in the stable phase, the development of the disease basically stops, no new rashes appear, old rashes develop slowly, and inflammation is reduced. In the receding phase: the rash gradually shrinks and flattens. There is a tendency to fade on its own, but most patients have their skin lesions gradually reduced or faded only after the treatment. 8.What is reverse psoriasis? The lesions of a few patients mainly involve or only involve the vulva, under the breast, groin, umbilicus, axilla and other folds, and the lesions seem to be on the opposite side of the general prevalent parts, so it is called reverse psoriasis. This disease should be mainly distinguished from friction erythema, seborrheic dermatitis and candidiasis in the crease area. 9.Why is there so much scaling in psoriasis? This is because the epidermal cells proliferate too fast. The normal epidermal turnover time is about 26-28 days, while the epidermal turnover time of psoriatic lesions is 3-4 days. The epidermal cell turnover time is significantly shortened. Therefore, many skin scales are produced.