Petechiae appeared after拍完八虚 (Note: "拍完八虚" is a traditional Chinese therapy term that may refer to a specific tapping or percussion technique; it is retained here as the exact meaning may require cultural context).

Generally,拍八虚 (Ba Xu tapping) is a traditional Chinese medicine practice that helps regulate the flow of qi and blood and promote overall health. The appearance of petechiae (small red or purple spots caused by bleeding under the skin) after Ba Xu tapping may result from excessive tapping force, dampness accumulation, allergic reactions, circulatory disorders, or platelet dysfunction. Patients should seek medical advice for appropriate symptomatic treatment. Specific causes are analyzed as follows:

1. Excessive Tapping Force

If the tapping force is too strong or the frequency too fast, it may excessively stimulate the skin and blood vessels, leading to capillary rupture and bleeding. It is recommended to maintain moderate force and frequency during tapping to help alleviate such symptoms.

2. Dampness Accumulation

If a person already has excessive internal dampness, it may easily lead to damp-heat in the body, which could manifest as red spots after Ba Xu tapping. Under medical guidance, patients may take herbal formulations such as Qingre Qushi Granules or Shenling Baizhu Powder to address this condition.

3. Allergic Reaction

If the patient has been exposed to allergens such as dust or pollen, an allergic reaction may occur, resulting in the appearance of petechiae after tapping. As directed by a physician, antihistamines such as Cetirizine Hydrochloride Tablets or Loratadine Tablets may be used for treatment.

4. Circulatory Disorders

Impaired or obstructed blood circulation can increase intravascular pressure, making blood vessels more prone to rupture and causing petechiae. Under medical supervision, medications such as enteric-coated aspirin tablets or Xueshuantong Capsules may be prescribed to improve circulation.

5. Platelet Dysfunction

Platelets are essential blood components involved in hemostasis and maintaining vascular integrity. Abnormal platelet function—such as coagulation disorders or conditions like allergic purpura—can also lead to bleeding spots. Under medical guidance, patients may be treated with medications such as Dexamethasone Tablets or Methylprednisolone Tablets.

If symptoms are severe, patients should seek timely medical attention to avoid disease progression. It is also important to maintain healthy lifestyle habits and avoid spicy or irritating foods to support recovery.