Redness and swelling at the vaccination site after Neocoronavirus vaccination usually subsides within 1 to 3 days. Redness and swelling at the vaccination site after vaccination with the new crown vaccine is usually a very common adverse reaction to the new crown vaccine. When the vaccination site is red and swollen, do not rub the red and swollen area, and do not get wet to avoid bacterial infection. Usually, the redness and swelling at the vaccination site will subside on its own, usually within 3 days. After vaccination, it is recommended to eat a light diet and prohibit spicy and irritating foods such as chili peppers and fish, which are easy to be allergic to, in order to avoid allergic reactions and aggravation of the pain at the vaccination site. Be careful not to lift heavy objects with the vaccinated arm, which is conducive to the improvement of symptoms. Precautions after vaccination, specific can consult a professional physician’s opinion.