So I just woke up from a nap and noticed this on the back of my arm. I don't know if it was there before because I don't really pay much attention to the back of my arm but what on earth is it? I know the grey looking bump is that color because the soap I use has a grey residue, or at least that's what I'm telling myself so I don't start thinking its a flesh eating disease, but what is it exactly and what is that open sore looking think next to it? I've never had anything like this before in my life and I'm 9 months pregnant so I'm kind of freaking out right now. I don't know how to make pictures TMI so I just put one in the comments.