What causes red spot-like痧 (sha) to appear after lymphatic scraping?

Under normal circumstances, the appearance of red petechiae (sha) after lymphatic scraping may be related to normal physiological responses, improper technique, excessive dampness in the body, damp-heat, or deficiency of both qi and blood. Patients are advised to follow medical advice for symptomatic treatment. Specific analyses are as follows:

1. Normal Phenomenon

During gua sha, a specialized scraping tool is used to repeatedly rub both sides of the neck, promoting local dilation of subcutaneous capillaries and causing the skin to appear red, purple, or dark purple. If the skin's stratum corneum is thin, petechial sha may appear. This is considered a normal reaction and does not require excessive concern; symptoms typically resolve on their own over time.

2. Improper Technique

If gua sha is performed improperly, it may damage the skin, leading to redness, pain, and in severe cases, blistering. As directed by a healthcare provider, topical applications such as safflower oil or swelling-relieving analgesic tincture may be used. Cold compresses can also aid in recovery.

3. Excessive Internal Dampness

Prolonged consumption of raw, cold, or greasy foods may lead to excessive dampness in the body, which may manifest as red petechial sha during gua sha. As prescribed, medications such as Shenling Baizhu San or Liu Junzi Wan may be taken to improve the condition.

4. Damp-Heat

Constant exposure to damp environments may allow damp-heat to invade the body, resulting in red petechial sha after gua sha. According to medical guidance, heat-clearing and dampness-resolving medications such as Longdan Xiegan Wan or Qingre Qushi Granules may be taken.

5. Deficiency of Both Qi and Blood

In patients with dual deficiency of qi and blood, red petechial sha may appear during gua sha, possibly accompanied by fatigue, dizziness, and blurred vision. Under medical supervision, tonifying formulas such as Shi Quan Da Bu Wan or Ba Zhen Granules may help alleviate symptoms.

To avoid physical injury, it is recommended to seek treatment at a reputable medical facility under the guidance of qualified professionals. If discomfort is severe, prompt medical consultation is advised to prevent disease progression.