Arthritic purpura generally refers to joint-type allergic purpura, and the symptoms include skin purpura as well as joint swelling, pain, dysfunction and other manifestations. Henochromic purpura is a common vascular allergic reaction disease, often with skin purpura, often in batches, symmetrical appearance in the lower limbs and buttocks, crimson plaques, press the color does not fade. According to the different parts of the blood vessels involved, there are different parts of the symptoms, can be divided into simple type, joint type, abdominal type, renal type and so on. In addition to the typical rash, the symptoms of arthritic purpura include joint swelling, pain and dysfunction caused by blood vessel involvement in the joints, which mostly occurs in large joints such as knee, ankle, elbow and wrist, etc. The symptoms of arthritic purpura are recurrent and wandering, and the disease can be recovered in a few days without leaving any deformity of the joints. Arthrogryposis purpura is a hematological disease. As joint symptoms may be first diagnosed in orthopedics or rheumatology, it can be treated with antihistamines such as chlorpheniramine, glucocorticosteroids such as prednisone, and immunosuppressants such as azathioprine under the guidance of a doctor.