There are lots...: ...Of possibilities, but this time of year it is most likely to be an allergic response to something that came in contact with your arms, such as poison ivy, particularly if you've been working in the garden or camping or clearing weeds. Over-the-counter creams are too weak for such rashes, so let a dermatologist give you a precise diagnosis and treatment. Could we see the photos?
Answered 3/31/2017
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