Purpura refers to a clinical symptom of subcutaneous hemorrhage, which itself is bleeding, so there is no hemorrhagic purpura as a medical condition. Usually, purpura, including allergic purpura, intravascular pressure increased purpura, idiopathic thrombocytopenic purpura, and pigmented purpuric erythrodermic dermatoses, etc., will have the symptom of subcutaneous hemorrhage, and the patient needs to consult the doctor in time to determine the type of purpura. Purpura is a kind of subcutaneous red patches, the edge is relatively clear, with the hand to press will not fade, the vast majority of no obvious feeling, just found that the skin appeared red, but no pain or itching symptoms. 1, allergic purpura: patients may appear joints, or abdomen and other parts of the pain, this is due to the joints or abdominal blood vessels permeability increased, resulting in the leakage of blood vessels inside the components to the outside, resulting in the emergence of pain Symptoms, generally rare, allergic purpura is usually seen in children, in crying, shouting, or mental stress, the face appeared in the subcutaneous bleeding; 2, increased intravascular pressure purpura: mostly the size of a pinpoint, clustered or scattered petechiae, in the face, the upper limbs may be swollen, with a lot of purple dots, a few days in order to fade; 3, idiopathic thrombocytopenic purpura: refers to the unexplained increase in vascular permeability of the skin, and the resultant increase in vascular permeability of the skin, and the increase in vascular permeability of the skin. Vascular permeability increase, and lead to the symptoms of subcutaneous bleeding, skin and mucous membranes will spontaneously bleed, usually pinpoint intradermal or subcutaneous hemorrhagic spots, a few patients have subconjunctival and retinal hemorrhage, may also be accompanied by fever; 4, pigmented purpura erythroderma: is a similar to purpura manifestation, mainly scattered, smooth surface, round or polygonal papules, usually occurring symmetrically in the calves, femurs and the Lower trunk, due to prolonged standing and other causes of subcutaneous hemorrhagic manifestations, the surface of red spots or dilated capillaries, may have scales, sometimes fused into irregularly edged patches with blurred edges. The appearance of purpura should be judged and categorized according to the cause of the disease in order to carry out targeted treatment. If it is allergic purpura, we must look for allergens and cooperate with the doctor for treatment. If it is increased intravascular pressure purpura can generally be self-healing, the pressure disappears within a few days can subside, for pigmented purpura erythematosus dermatosis, usually need to let the patient to avoid standing for a long time, if necessary, oral improvement of blood circulation drugs, such as Mai Zhi Ling tablets, horse chestnut seed extract tablets, etc., can improve the symptoms.