Simple skin type: there are only red spots and erythema on the skin, which can bulge into blocks and do not fade when pressed, mainly distributed in lower limbs and buttocks.

Joint purpura: In addition to skin red spots and erythema, it is also accompanied by joint symptoms such as wandering joint swelling and pain and muscle pain. Abdominal purpura: also known as gastrointestinal purpura, accompanied by abdominal symptoms such as periumbilical abdominal pain, nausea and vomiting, and bloody stool. In addition, there are skin red spots and erythema. Nephrotic purpura: In addition to skin red spots and erythema, symptoms of renal invasion such as urine occult blood and urine protein are also detected. In severe cases, chronic nephritis and renal insufficiency may occur.