Hello, according to the symptoms you mentioned, you are most likely to consider urticaria, which belongs to allergic skin disease.

Suggestion:

It is suggested that cetirizine or loratadine should be taken orally, and Ou Ning or Aronson or calamine lotion should be used externally. Eat less fish, shrimp, milk and other foods with high protein content, change sheets frequently and pay attention to hygiene.