Posted 8/12/2012 3:46 PM (GMT 0)
It could be caused by either, or by chiggers, or mosquito bites, or allergy to something like poison ivy or poison oak, or any of a myriad of other things. Itching usually responds well to a topical cortisone cream available over the counter, however with your history of serious allergic reactions it would be best for you to see a doctor for diagnosis.
We are not doctors here, and cannot diagnose your condition, so please do see your own doctor.