As far as the other pattern on your arm I agree most doctors would really just look at you and try to say something that sounded like they knew what they were talking about.
It's on my left side...but yeah I can just imagine how that would go.
"Hey, Doc. I think beings from another reality put some freckles on me. Could you take a look at'em and tell me what you think."
I'm sure he has a special pill for those types.