Petechial hemorrhage after scratching may be caused by skin allergy, external stimulation, purpura and other factors.
1. Skin allergy: usually skin allergy may lead to redness and swelling of the skin, and may also lead to the rupture of subcutaneous capillaries, resulting in ecchymosis after scratching the skin.
2. External stimulation: due to local excessive scratching, there may be local pressure stimulation, leading to subcutaneous capillary rupture, which leads to petechial hemorrhage after scratching the skin.
3. Purpura: such as allergic purpura and idiopathic thrombocytopenic purpura may also lead to ecchymosis on the skin after scratching.
There are many other reasons for petechial hemorrhages after scratching, so we suggest that patients should consult a doctor in time and under the guidance of a professional doctor to carry out regular treatment.