What bit me
Unless you documented the specimen (read: took a picture of or collected the actual specimen), unfortunately, we will not be able to identify the biter even though many of us, including myself personally, are trained entomologists and arachnologists. Insect and arachnid bites cannot be identified by marks on the skin as individual people react differently to trauma to the skin. Read this article about mystery bites from the University of Kentucky: https://entomology.ca.uky.edu/ef649.
If you are concerned, please seek out a dermatologist or similar medical professional.