Leopard gekko with crust/growth under the eye. Fine in himself, eating and being

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Leopard gekko with crust/growth under the eye. Fine in himself, eating and being active. Temps are good (25 in cool end, 33 in hot end). Led strip, no uvb. Fed crickets and dubias. Calsium with and without vit D3. Humidity 30%, has hides and humidity box. Usually not squinting eyes like in the picture. Can it be a scab? Owner thinks he might have injured himself on a branch. Noticed it a week ago. No change in appearance since then. I have suggested uvb and exchanging the calcium with D3, to a vitamin supplement containing vit A. Any thoughts on what this can be? Considering sedating him and doing an FNA, but it is quite small...