question on diving problem

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As others have said, he should see a doctor. Having blood coming out is a sign of trauma of some kind and should not be happening routinely.
 
Find an Ear Nose and Throat specialist who knows something about diving. Call DAN and ask them to recommend someone in your are.

While waiting for that appointment, he should refrain from diving!

But he can still do research. A great place to start is here: Prevention of Middle Ear Barotrauma
 

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