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This can be anything from an infection (which would need antibiotics to clear up) to an injury cause by himself, something in the cage or even the bedding or even a cyst behind the eye itself. Until you can see a vet with your little guy, please remove the bedding from the cage (to decrease further irritation) and you can use plain white paper towel in place of it. Just watch him to make sure he doesn't ingest it. You can also flush the eye with sterile saline solution to flush out any debris that is in the eye. I would call your vet to have him checked out and properly treated with prescription medication if needed. I wish you all the best with your little guy :)