survey found that the mean age of first foreskin retraction is 10.4 years.

Rickwood, as well as other authors, has suggested that true phimosis is over-diagnosed due to failure to distinguish between normal developmental non-retractability and a pathological condition. Some authors use the terms "physiologic" and "pathologic" to distinguish between these types of phimosis; others use the term "non-retractile foreskin" to distinguish this developmental condition from pathologic phimosis.

In some cases, a cause may not be clear,

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