Why Did a Sudden Purple Patch Appear on My Body?
A sudden purple patch on the body may be caused by vascular factors, platelet factors, coagulation and anticoagulation factors, or simple purpura. Here are the possible reasons:
1. Vascular Factors
Due to genetic factors, severe infection, or lack of vitamin C, the fragility of capillaries increases. When the skin is slightly bumped or rubbed, capillaries may rupture, leading to the appearance of purpura or ecchymosis under the skin.
2. Platelet Factors
Platelets help stop bleeding when any part of the body is injured. If the number of platelets decreases or their function is impaired, spontaneous petechiae may appear on the skin, often accompanied by abnormalities such as bloody noses, bloody stool, bloody urine, or excessive menstrual bleeding. In the most severe cases, leukemia patients may also develop ecchymosis due to low platelet counts.
3. Coagulation and Anticoagulation Factors
When individuals suffer from hemophilia or lack vitamin K, they may frequently experience purpura, and once bleeding occurs, it can be difficult to stop. Even those without a clear history of trauma are still at risk of developing this condition. It is recommended to undergo a blood routine test at a hospital first. If the results are normal, further examination is needed.
4. Simple Purpura
Some people may spontaneously develop bleeding under the skin of their lower or upper limbs even without the above-mentioned diseases. Sometimes, it manifests as pinpoint-sized bleeding points, and sometimes as patchy ecchymosis. The color starts as red, then turns purple, and after 2-3 days, it turns brownish and gradually fades away. The size and distribution of skin petechiae or ecchymosis vary, and they are not raised above the skin surface. They do not fade when pressed and are painless. This condition is known as simple purpura. It is more common in women, especially during menstruation, which may be related to increased capillary permeability caused by changes in hormone levels.
