It's unlikely ab formation because the reality is that abs don't show up until your body fat percentage is quite low. The layer of fat over them needs to be thin to see them. So if you're specifically seeing them in an area that has a thicker layer of fat, it's not your muscle definition poking through.
As to whether you have a tear or a hernia or something, I don't know. How sore are you? Maybe wait a couple days for the DOMS to recede. If it doesn't, then you might have an injury.
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