George gets it all the time (I suspect because he doesn't wash properly round his eyes) - Ed used to get them, but not as much (I suspect because he was better at cleaning round his eyes).
It's never been a problem with George - wasn't with Ed till he went blind, and then I kept finding hairs stuck in it, and in his eyes generally that I'd have to take out.
But if it concerns you, call the vets - better to put your mind at rest than worry.