Its always better that a specialist sees the part. some issues like possibility of fracture
or internal bleed can at times be missed by parents and even doctors too. The bump forming is like a bruise
with blood collection inside.. which may trickle around eyelids and may give a black eye that may last for few days.
do keep a watch on danger signs of head trauma
like say disturbances of sleep, behaviour, consciousness, feeding, bleeding and convulsions.