What causes unbearable itching after applying the Sanfu patch?

Oct 17, 2023 Source: Cainiu Health
Disease description:

After just applying the Sanfu patch, I'm experiencing severe itching. I'd like to consult about what might be causing this?

Doctor's answer (1)
Dr. He Haochen
After applying the Sanfu patch, extremely intense itching of the skin may be caused by factors such as drug allergy, allergic skin reaction, dry skin, or infection. Certain herbal ingredients in the Sanfu patch may trigger allergic reactions, leading to skin itching. In addition, individuals with sensitive skin may develop allergic reactions to external stimuli. Furthermore, dryness of the skin after application, or inadequate cleanliness and hygiene, may lead to skin infection and subsequent itching.