I would be pleased to answer your question
Since it is the ear that has been involved in the trauma , I would suggest that you should take him immediately to the ENT or the doctor . The ear has a a very thin skin and cartilage
content and hence has a great chance of damage if treatment is not given early .
Continue the ICE application and take him to the doctor . You can give him a dose of a pain killer like paracetamol
. Do consult your GP for the dose .
Thanks and Take care