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This is Dr. David
do you have a clear jpg photo of the area you can upload?
there looks to be excessive moisture and sweat there which can lead to fungal infections in the perineum
which can lead to itchy skin and redness there.
yes, he should be using antifungal powders and sprays on that area. I would avoid creams as this can add more moisture to the area
try to keep the area as dry as possibly
he may have to use baby powder on the area twice or three times a day to keep the area dry.
I'm not sure what you mean by tiny red dots all over him.