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==Washing==
Birley et al. (1993) studied 43 men with recurrent or persistent [[balanitis]] at an outpatient genitourinary disease clinic in London, [[United Kingdom| UK]] where most men are [[intact]]. Of the study group only 33 percent were [[circumcised]]. Birley and colleagues discovered that the men in that group washed frequently with soap or shower gel.
The men were instructed to wash less frequently, to stop using soap, and to treat with emollients. The soap and shower gel apparently removed the natural skin oil, which appears to be essential for health of the [[mucosa]] of the preputial sac.<ref name="birley1993">{{REFjournal
The presence of the healthy microbiome, the [[Langerhans cells]], and the lytics in the sub-preputial moisture give the preputial sac strong immunological functions. [[Circumcision]] destroys the preputial sac and its protective immunological functions and makes the patient more vulnerable to [[infection]] throughout life.<ref name="fleiss1998" />
One frequently hears the advice to wash the preputial sac at least daily to prevent [[infection]]. This advice is outmoded.<ref name="fleiss1998birley1993" /> <ref name="birley1993fleiss1998" /> Washing may introduce pathogens into the preputial cavity.<ref name="fleiss1998" /> It also removes the skin oil and protective lytic substances described above. It is better to rinse only as necessary, using only clear warm water.<ref>{{REFbook
|last=Bigelow
|first=Jim