It happens: He likely broke a blood vessel inside the skin that triggered the swelling. These will often show later as a deep bruise. If it interferes with his feeding & play have him seen, if not you can monitor it at home & it may self heal.
Answered 12/6/2018
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4 doctors weighed in across 2 answers
A doctor has provided 1 answer
A doctor has provided 1 answer
4 doctors weighed in across 2 answers
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