Red bumps on the body after a new crown vaccine are usually considered an allergy. Biological agents such as the new coronavirus vaccine are effective in preventing new coronavirus infections, reducing the incidence of new coronavirus pneumonia, and also preventing patients from developing severe disease after the onset of the disease. However, the vaccination of the new coronary vaccine may lead to some adverse reactions, the red bumps on the body is considered to be caused by the body’s allergy to some of the ingredients contained in the vaccine, if the allergic reaction is relatively mild, usually disappear on their own, do not need to carry out special treatment. However, if the symptoms are not relieved for a long time, or continue to aggravate, we should pay attention to timely medical attention, timely compliance with the doctor’s instructions for anti-allergy treatment, individuals in the new crown vaccine, pay attention to close observation of the body’s changes, there is anomalies can be timely consultation with a physician, do not be negligent, so as not to delay the condition. [Tip] This article refers to the “new coronavirus pneumonia, new coronavirus pneumonia”, etc., has been December 26, 2022, the National Health Commission issued a notice to change the name to the “new coronavirus infection”.