I want to say that looks like a really minor infection (because of the crispy look to it), but it could also be an injury.
Assuming your husbandry is correct, my guess is that will probably disappear on its own even with no intervention. If you want, you can put some betadine on a Q-tip and swab the area with it. If it's an infection, it'll combat it, and if it's an injury it'll prevent infection from setting in.
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