2, if not food, but due to skin mite infections, you can kill mites with the drug "mite" treatment;

3, and then observe, if there is obvious itching or running water, etc., it may be caused by allergies, can be anti-allergy drugs. The first thing you need to do is to look at the mites and see if you can find a way to get rid of them.

All in all, it is best to go to the hospital to check the causes and symptoms, so as to promptly treat the symptoms.