Question
After my baby received a vaccination, a hard lump the size of an egg appeared on their left shoulder. The lump does not have pus or effusion, and the baby shows no reaction when touched, and it may not be painful. Is this a reaction to the vaccination? How should I handle this lump?
Answer
The hard lump that appears on the baby’s shoulder after vaccination is a normal phenomenon and usually subsides within 24 hours. Parents should encourage the baby to drink more water to lower body temperature and promote metabolism, and avoid using antibiotics or hormonal medications. If the baby has a fever, medical attention should be sought promptly. It is recommended that parents rest at the vaccination site for at least 30 minutes after vaccination to handle any adverse reactions promptly. If the lump does not subside over a long period, it is suggested to use a wound ointment with blood circulation and heat therapy with a hot water bag, or regional physical therapy. Wishing the baby a healthy recovery.