A small rash in clusters appears almost pattern like an elongated diamond ( several groups) all the way down right arm. Rash is tiny flat bumps shaping the pattern, same color as my skin. Prior to the rash appearing I feel like an electrical charge similar to that when you get the chills only stronger. My hair on my head and my arm literally stand up. It goes as fast as it comes. Should I be concerned. I am 27. This has happened 3 times now. The last time I could not get my hair to lay down on my arms for a minute.