Quote: (Originally Posted by RichClark)
Hi Peter,
I actually had the exact same problem. I tends to happen to me when my mask strap isn't tight enough - I think it's caused by a small amount of involuntary nose breathing.
Next time it happens, try holding your nose and see if the problem goes away.
Cheers
Rich
Thanks Rich,
Glad I'm not the only one. I'll try to tighten my mask strap.

But I already have mask marks on my face hours after each dive.
Anyone with a scientific explanation on what is actually going on.
Thanks,
Peter