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I recommend CALADRYL Lotion [calamine plus benadryl combination, available OTC], in small amounts, 2-3x/day; if you blow-dry it dries quickly.
However, if the rash is widespread or involves the glans [head] penis, then I recommend you see an MD for prescription meds such as an oral steroid taper.
Best Wishes for Your Health
--Dr. Steve, M.D./FABFP (Your Online Family Doctor)