Could be sinus squeeze, I would say it's even likely, but you should eliminate the possibility of lung squeeze. And in any case, take a break from diving.
I get this every now and then. Some of the frontal sinuses get blocked and then I'm stupid enough to keep diving anyway, resulting in some bleeding from the nose.
The thing is, if you don't let it heal properly, it will keep on happening and I'm sure it's not very healthy in the long run. All kinds of infections and nasty things can hatch in there and just make the problem worse.
If the problem persists, a visit to a good ENT doctor would propably be in order?
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Simo K
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