Could it be a bot fly? Are they out in the south still this time of year?
The fact that it is raised concerns me, makes me think it's either bot fly or something or it is becoming infected. If it is infected and it is raised you may have to start antibiotics if left untreated she may need surgery with a drainage tube.
But if it is not that raised & he's not affected by it at all then I would just keep it clean & watch it like most of the others suggested.
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