Your bite/sting mark is missing something very essential in order to qualify it as a bite or sting mark, and that is: a mark from a bite or a sting. Had something bit you or stung you, then you would be able to sesee a little hole or pincer mark in the middle of that very colourful bruise you have.
Coincidence of all coincidences, I lived in Miamisburg for a summer, and got mysteriously bit by something venomous while knocking doors out there around Dayton. Only it didn't turn purple or green, it turned orange, puffed up and blistered, but still had a very obvious bite mark in the middle of it. I then started getting itchy orange puffy spots all over my body because the venom had poisoned my blood, a very disturbing experience all around, I suspect it was a spider, but got no confirmation on exactly what.
Point is, venom doesn't turn your skin those colours. I've been stung by wasps and bitten by ants too, they don't look like a bruise, and they always puff up.