The manifestations of arthritic purpura include prodromal symptoms, skin symptoms, joint discomfort and so on. 1. Prodromal symptoms: most patients have general malaise, malaise, and low-grade fever 1 to 3 weeks before the onset of the disease. 2. Skin symptoms: Purpura varies in size, initially dark red, does not fade when pressed, can be fused into a piece, and gradually becomes light yellow, yellow-brown, purple, etc. within a few days, and gradually fades in 7 to 14 days. Often appear in batches, symmetrical distribution, can be accompanied by urticaria, skin edema. 3. Joint discomfort: joint pain, swelling, pressure and dysfunction occur due to the involvement of blood vessels in the joints, recurrent and wandering attacks, mostly occurring in the wrist, elbow, knee, ankle and other large joints, healed after a few days, without leaving joint deformity. When the above symptoms occur, patients should go to the hospital in time, under the guidance of the doctor to standardize the treatment, do not self-medication.