Purpura is a general term for color change after bleeding of skin and mucous membrane. The clinical manifestations are bleeding spots, purpura and ecchymosis, which are generally not higher than the skin surface. Only when allergic purpura occurs, it can be slightly raised, starting with purple, not fading after being pressed, then gradually becoming shallow, and turning yellow and fading after about two weeks.
Purpura * * * is divided into four categories:
1, simple purpura generally has no systemic symptoms, and needle-sized scattered bright red petechiae can appear on both lower limbs, which will not fade after pressing. After seven days, the color gradually faded. But there are new petechiae.
2. Idiopathic thrombocytopenic purpura can be divided into acute type and chronic type. Acute type is rare, can occur in children, and often has a history of infection before onset. The characteristics of the disease are sudden onset, fever, extensive bleeding of the skin, massive ecchymosis, hematoma, bleeding of mucous membrane and urogenital tract, and obvious decrease of platelets, which can be less than 5000 /mm3. Chronic type is more common, more young women, slow onset, continuous or repeated bleeding. It not only occurs in the skin, mucous membrane or internal organs, but also bleeds in severe cases.
3. Rheumatic purpura has slightly raised ecchymosis of rice grain size on both lower limbs, and ecchymosis, wheal or edematous erythema may also appear. At the same time, joint swelling and pain can occur, and systemic symptoms such as fever and limb weakness can also occur.
4. The skin manifestations of abdominal purpura are the same as those of rheumatic purpura, but there may be abdominal pain, vomiting, diarrhea, acute diarrhea, stool bleeding and other symptoms. In severe cases, intussusception may occur.