After taking traditional Chinese medicine, red itchy spots appeared on the body. Why is that?

Generally, developing red rashes and itching after taking traditional Chinese medicine (TCM) may be caused by factors such as drug component irritation, individual tolerance differences, drug allergic reactions, contact dermatitis, or drug rash. It is recommended to seek medical attention promptly, identify the cause, and receive symptomatic treatment under a doctor's guidance. Detailed analysis is as follows:

1. Drug Component Irritation: Some TCM contains irritating components that may stimulate the skin, causing red spots and itching, usually mild reactions. Discontinue the TCM temporarily, clean the skin with warm water, avoid scratching, monitor symptom changes, and symptoms typically improve after stopping the medication.

2. Individual Tolerance Differences: Different people have varying tolerances to TCM, and some individuals may be sensitive to certain components due to their constitution, resulting in skin reactions. Adjust the dosage or switch medications as directed by a physician, wear loose cotton clothing, reduce skin friction, and keep the skin dry.

3. Drug Allergic Reaction: An allergy to specific components in the TCM may trigger an allergic reaction, manifesting as red spots and itching, possibly accompanied by localized swelling. Patients may take medications such as Loratadine Tablets, Cetirizine Hydrochloride Drops, or Chlorpheniramine Maleate Tablets as directed by a physician. Immediately discontinue the allergenic TCM, record the allergenic component to avoid future exposure.

4. Contact Dermatitis: Skin irritation may occur at the contact site after exposure to the TCM liquid, or an allergic reaction to the container holding the TCM, causing red spots and itching. Avoid direct contact between the medication and the skin, change the container, apply topical medications such as Desonide Cream, Mometasone Furoate Cream, or Hydrocortisone Butyrate Cream. Oral antihistamines may be used for severe symptoms.

5. Drug Eruption: A skin and mucous membrane inflammatory reaction caused by TCM, with red spots potentially spreading, severe itching, and possibly accompanied by vesicles and fever in severe cases. Patients should take medications such as Prednisone Tablets, Vitamin C Injection, or Calcium Gluconate Injection as directed by a physician to aid skin recovery.

Monitor skin condition closely while taking TCM, and promptly inform the doctor of any discomfort. Store TCM properly away from light and moisture in daily life, and check the medication's appearance before use to avoid taking degraded drugs, thereby reducing the risk of adverse skin reactions.