Strange red shapes appear on arm

I have this weird irregular shape that showed up on my arm. It looks like I have been stamped in red or somthing? It dissapears then reappears again in the same exact shape. It doesn't hurt or itch or anything. I first thought I layed on somthing and that what made the shape outlined red. Then it went away and keeps reappearing. It looks almost like I have been branded, bc of the shape, it connects. I want to know if it could be maybe alleries, which I have no signs of, or just my viens looking weird? I haven't seen or heard anything like it so it leaves me very confused?

[bbxx]

That is really odd. This is a heart rythm community though, so I doubt you will get much help here. You should post this in general health or undiagnosed. Post back here though when you find out what it is. Interesting.

[bypeep]

It looks like veins. And, if it's coming back in the same pattern, same spot, that makes it more likely. But, I'm not an expert, just guessing. I get something similar on my legs when I get cold, or sometimes when I get cold and then warm up quickly. It could be normal for you, but if it's really bothering you or you have other symptoms along with it like swelling, pain, fever or bruising, I'd have it checked out.