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{{FleissP HodgesF VanHoweRS 1998}}
'''Ballooning of the foreskin''' occurs when [[urine]] flows out of the [[urethra]] of the [[penis]] faster than it flows out of the [[foreskin]] of an intact boy. Ballooning cannot occur until the inner layer of the foreskin has separated from the [[glans penis]] to which it is attached by a [[synechia]]. Although ballooning is a developmentally normal condition, not every boy experiences ballooning. Ballooning may cause some transient, temporary discomfort if it pulls apart the synechial connection to the glans penis.
The layer of [[dartos]] muscle in the foreskin keeps the tip closed to protect the penis from infection.<ref name="fleiss-hodges-vanhowe1998">{{REFjournal |last=Fleiss |init=PM |author-link=Paul M. Fleiss |last2=Hodges |init2=FM |author2-link=Frederick M. Hodges |last3=Van Howe |init3=RS |author3-link=Robert S. Van Howe |title=Immunological functions of the human prepuce |journal=Sex Trans Infect |date=FleissP HodgesF VanHoweRS 1998-10 |volume=74 |issue=5 |pages=364-67 |url=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1758142/pdf/v074p00364.pdf |quote= |pubmedID=10195034 |pubmedCID= |DOI= |accessdate=2020-05-17}}</ref> The pressure of the [[urine]] is necessary to open it to allow passage of [[urine]]. The pressure is what causes the ballooning.
Babu et al. (2004) compared boys with ballooning with boys without ballooning. No evidence of obstructed urinary flow was found. Ballooning is a self-limiting condition that disappears with normal development.<ref name="babu2005">{{REFjournal
|etal=no
|title=Ballooning of the foreskin and physiological phimosis: is there any objective evidence of obstructed voiding?
|journal=BJU Int
|location=