I have had this annoying hard lump that keeps showing up on my arm, and is really itchy and annoying. It feels like a bite, but I have had it for months, and it goes away for a while and then randomly flares up again. The forum won;t let me upload an image, so here is a link to the photo on onedrive. https://1drv.ms/u/s!ArStyk-0E02-rYAxe-8MBG0P52FrvA