Some infections are not caused by bacteria as such, but are inflammations caused by irritants. There are some types of antibiotic which address inflammation rather than bacteria, though for some reason they are not used much now. So if sand gets into a moist area it can cause problems not associated with whether the person has washed or not. Usually these areas are self-cleaning anyway.
There is a condition called balanitis which can have several causes, but occasionally a biopsy will reveal a small foreign body inside the area which sets up an inflammation. This could be sand or soot, so in the desert it could be that a common problem occurs not directly related to the lack of water as such, but to the presence of sand flying around. Also I doubt that early Arabs had antibiotics even though their knowledge of medicine was good.
In this country I can't see the point in performing circumcision routinely.
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