I think it started out as a scratch although even at the time I couldn't think of any way I could've scratched my arm but after a couple of weeks it turned into this rash. It's kinda itchy although I have refrained from scratching it.
Moderator comment:I have deleted the links to the images as they went to a site unsuitable for inclusion in the forums. Users can upload images directly to this site by using the icon at the top right of reply boxes.