​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​Anyone have an idea what this is? It's on my inner arm. Doesn't really itch. I don't think I'm allergic to anything.