I have seen a large blank ant with a large pointed stinger in Alabama, and here in Piney Woods region of Texas. That stinger means business, but it doesn’t leave the large, longlasting red whelps that fire ants do. It stings and gets better in a little while. It may or may not be what you have.
I know one thing, put Boric acid in affected areas or use those horse apples and they will LEAVE as fast as they can. I used to pick those horse apples at my old apartment and never had a problem with critters.