It does sound as though he may have a fungal infection. Get some cream called Lotrimin. Which you can get at your local pharmacy. Wash the area with a mild soap, pat dry well. Once dry apply cream. You will see a great improvement in just a few days. Once it's cleared up, do continue using the cream for an additional 3 days to ensure the infection is gone.
If by chance there is no change after 36 hours, then you need to have him seen for an in person evaluation. As he may need a scrapping and sent to the lab.
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