Strange Bump Near the Tail

Alright im asking opinions on what this bump can be? He eats and poops fine. Doesnt seem to have any problems. What are yall’s thoughts?

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Could be an infected hemipene (if male) or sent gland


Not sure, but for me itd be a vet visit. My best guess is an abscess of some sort, usually caused by cancer or a local infection. Either way, something best handled by a trained professional. I would not wait for it to get better on its own.