Anyone know what this could be? It's on my arm and only showed up after he area itched like crazy a…

Anyone know what this could be? It's on my arm and only showed up after he area itched like crazy a few days ago. It's itched on and off seldomly since then. I'm not allergic to anything, and even if i became allergic (being pregnant and all) I figure I would have a bigger or different reaction depending on what the reaction is to. Nothing has been contained to that little part of my arm.