Question

My son received the Hib vaccine yesterday, and the injection site on his arm has developed redness, swelling, and hardness. I would like to know if this is a normal reaction and if I need to seek medical attention.

Answer

After vaccination, redness and swelling at the injection site on the arm can be a common mild reaction, which usually does not affect the vaccine’s effectiveness. It is suggested to use raw potato slices for cold compresses, applying for 15 minutes each time, multiple times a day. If the symptoms do not improve, please seek medical attention promptly. Maintain a positive attitude, and wish for good health.