It is possible that the red persistent plaque on your arm could be caused by eczema, dry skin, or irritation from a substance. You could try applying a moisturizing cream regularly, using a fragrance-free soap, and avoiding rubbing your skin too vigorously. Remember to not scratch or try to remove the plaque. If there is no improvement after trying these suggestions for a few weeks, it would be wise to consult a doctor for further evaluation.
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