Can you please tell me a little more about your problem. Are both arms involved from shoulder to your wrist? Is there a visible rash, redness, bleeding. Have you used any new laundry detergent, shampoo, soap, etc. Do you have any food allergies? Were you doing any yard work?
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Although shrimp can be a highly allergic food, the reaction would be within a few hours of eating it and would subside, with antihistamine and treatment, shortly after eating it. At this time you can take benadryl as per the dosaging on the package and see if it helps relieve the itching (if you are allergic to something). You may want to try soaking in a bath with Aveno flakes to soothe your discomfort as well. You can buy Aveno bath at a drug store. Apply topical hydrocortisone cream to the affected area to reduce itching. If these remedies do not give relief, then I would recommend a visit to the dermatologist for examination and treatment.