Have you made any progress on figuring out what they are and how to get rid of them? I have them too and every time I go in the coop I have to rinse my arms. It’s frustrating.I don't know what they are, but I think I've got them too. Took the young chicks out of the barn and put them in the run and when I came inside my skin was crawling. Pulled off 4 before I jumped in the shower.