1. Insufficient platelet count or abnormal platelet function.

2. The increase of vascular fragility leads to vascular rupture.

3. Some reasons lead to increased vascular permeability/decreased blood cohesiveness.

4. Regular exercise of antagonistic events such as kicking, hitting and throwing.

Because what you provided is not specific enough, you can only give a general idea. Disease analysis: Hello, this situation is generally caused by subcutaneous hemorrhage, which can be seen in relatives such as trauma, thrombocytopenia and abnormal coagulation function. If the blood test is normal and there are no other abnormalities, you can observe it temporarily. Pay attention to avoid trauma, avoid squeezing skin and soft tissue, and prevent abnormalities. Individual women can have this kind of situation, which can generally be gradually absorbed, so don't worry too much!