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A mohel (Hebrew: מוֹהֵל [moˈhel], Ashkenazi pronunciation [ˈmɔɪ.əl], plural: מוֹהֲלִים mohalim [mo.haˈlim], Aramaic: מוֹהֲלָא mohala, "circumciser") is a Jewish person trained in the practice of brit milah, the "covenant of circumcision."
The noun mohel (mohala in Aramaic) "circumciser", is derived from the same verb stem as milah "circumcision." The noun appeared for the first time in the fourth century as the title of a circumciser (Shabbat 156a).
For Jews, circumcision is mandatory, as it is prescribed in the Torah:
Biblically, the infant's father (avi haben) is commanded to perform the circumcision himself. However, as most fathers are not comfortable or do not have the training, they designate a mohel. The mohel is specially trained in circumcision and the rituals surrounding the procedure. Many mohalim are doctors or rabbis (and some are both) or cantors and are required to receive appropriate training both from the religious and medical fields.
Traditionally, the mohel uses a knife to circumcise the newborn. Today, doctors and some non-Orthodox mohalim use a perforating clamp before they cut the skin. The clamp makes it easier to be precise and shortens recovery time. Orthodox mohalim have rejected perforating clamps, arguing that by crushing and killing the skin it causes a great amount of unnecessary pain to the newborn, cuts off the blood flow completely, which according to Jewish law is dangerous to the child and strictly forbidden, and also renders the orlah (foreskin) as cut prior to the proper ritual cut.
Under Jewish law, a mohel must draw blood from the circumcision wound. Most mohels do it by hand with a suction device, but some Orthodox groups use their mouth to draw blood after cutting the foreskin.
The Centers for Disease Control and Prevention have recently (2012) issued a warning about the health implications of this practice, citing 11 cases of neonatal HSV and two recorded fatalities. A review (2013) of cases of neonatal HSV infections in Israel identified ritual circumcision as the source of HSV-1 transmission in 31.8% of cases 
According to traditional Jewish law, a woman should not be used as a mohel if a male mohel is available. However, most streams of non-Orthodox Judaism allow female mohels, called mohalot (Hebrew: מוֹהֲלוֹת, plural of מוֹהֶלֶת mohelet, feminine of mohel). In 1984, Dr. Deborah Cohen became the first certified Reform mohelet; she was certified by the Berit Mila program of Reform Judaism.