Large local reactions to vaccines, although sometimes scary looking, are not dangerous, do go away, and are not a reason your pediatrician should typically tell you to skip or delay your child’s vaccines.
Vaccine Side Effects
Most immunization side effects are mild and only last a few days.
SIRVA, or shoulder injury related to vaccine administration occurs when a vaccine is given too high into the shoulder joint.
We have more reports of side effects from flu vaccines simply because we give so many more flu vaccines than other immunizations.