Phimosis is a conition where the male foreskin cannot be fully retracted from the head of the penis. The word derives from the Greek phimos (φῑμός, "muzzle"). As most boys are born with a non-retracting foreskin, the term is confusing because it denotes both a normal stage of development, and a pathological condition (i.e. a condition that causes problems for a person). This confusion is particularly pronounced in regard to infants. Conflicting incidence reports and widely varying post-neonatal circumcision rates reflect looseness in the diagnostic criteria. Phimosis has become a topic of contention in circumcision debates.