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For a few days, I have been getting several small red bumps on my right arm and it's itching a lot.

Based on the symptoms described, it is recommended to try an over-the-counter antihistamine like Benadryl to help with the itching and redness. If the symptoms persist or worsen, it may be necessary to consult a doctor to determine the underlying cause. It is important to monitor the progress of the symptoms and seek further medical advice if needed.