Question

A four-month-old baby has developed a swelling at the injection site that has persisted for about half a month. What could be the cause of this?

Answer

This situation is typically not serious; it could be due to an accidental piercing of a capillary during the injection, leading to subcutaneous hemorrhage and the formation of a hematoma. Over time, the hematoma will absorb and disappear on its own. You can try cold compresses on the swelling area to help reduce the swelling. If there are no signs of fever or other discomforts, it is generally advisable to observe and wait for it to resolve naturally. However, if the baby shows signs of fever, pain, or other abnormal conditions, it is recommended to see a doctor as soon as possible.