Rashes on upper arm

I am experiencing rashes (boils) over the top surface of upper arm, they dry within 2-3 days but the entire surface has black spots. I daily rinse the area with a loofah to keep it clean but doesn't help. Please suggest a remedy. Is it an allergic reaction?
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Doctor Answers (1) on Rashes on upper arm

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Dr. Aman Sharma
11 yrs. of exp | Delhi | Dermatologist
P clear pic of the area will help could be pimples or pit. Folliculitis, or keratosis pillars commonly, need to address causes and step by step medication.
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