Papules are a clinical symptom of the basic damage of common psoriasis, which occurs on the elbows, head, and inner thighs. It tends to flare up acutely and pass chronically, with a tendency to recur. The clinical examination of pyoderma can be based on the basic symptoms of psoriasis vulgaris. Related tests: 1. Blood test: Most of the symptoms of psoriasis are more obvious and the doctor can make a diagnosis through observation without having to do auxiliary tests such as blood tests. Of course, some psoriasis patients have more special circumstances, at this time, it must be supplemented with other tests, such as blood tests, these tests are also to further accurately determine the condition, and the specific diagnosis and typing of psoriasis after the occurrence of rheumatoid rash is based on blood. 2, laboratory tests: rheumatoid factor negative, blood sedimentation may increase. 3.X-ray examination: there are mild hypertrophic changes at the edges of the involved bone joints, some patients present rheumatoid arthritis bone and joint destruction, but often involve the distal finger question joints, such as cartilage disappearance, joint surface erosion, joint gap narrowing, soft tissue swelling, osteoporosis, etc. 4, symptom examination: by the basic damage of common psoriasis tough start as wind papules, rice grain to soybean large or larger, and later gradually increased or fused into patches of different shapes and sizes, bright red or dark red color. Due to the large amount of psoriasis flakes, the protein, vitamins and folic acid and other substances that constitute the skin are lost. If the lesions persist for many years and spread throughout the body, it can lead to hypoproteinemia or malnutrition anemia.