Itchy red bumps on the body after vaccination may be an immune reaction or allergic phenomenon.
1. Immune response: vaccines are generally biological agents made of pathogenic microorganisms, which will produce an immune response after vaccination, which can be manifested as slight redness, swelling, itching, or accompanied by rashes at the place of vaccination, which can be relieved on their own.
2. Allergic phenomenon: patients allergic to certain components of the vaccine can cause an allergic reaction, resulting in itchy red bumps on the body.
If the red bumps are itchy after the vaccination, and there are no other uncomfortable symptoms, it can be observed first, and usually disappear with time. If the symptoms persist for a long time, or the patient is accompanied by fever, breathing difficulties and other symptoms, it is recommended to immediately seek medical treatment by a professional doctor.