On Monday I was wearing a fairly thick fishnet shirt. It's pretty tight around my arms, so when I was changing and noticed the pattern was still there, I didn't think anything of it. But it's Saturday and still on my arm. It's only on one arm, and it's not a burn/tan pattern (the empty spaces are white, where the fabric was is red). I've run into walls since with that arm and when I'd normally bruise easily I'm not.
I know this is really odd, but it's... unnerving. I have no idea what could be causing this and I get worried. Any thoughts at all would be wonderful