It takes literally 5 seconds to google the medical reasons for circumcision.
Taken from the Mao Clinic website.
Which I'm pretty sure is more qualified to answer these questions that people on a gaming forum comparing it to FGM.
Pros
- Easier hygiene. Circumcision makes it simpler to wash the penis. Washing beneath the foreskin of an uncircumcised penis is generally easy, however.
- Decreased risk of urinary tract infections. The overall risk of urinary tract infections in males is low, but these infections are more common in uncircumcised males. Severe infections early in life can lead to kidney problems later on.
- Decreased risk of sexually transmitted infections. Circumcised men might have a lower risk of certain sexually transmitted infections, including HIV. Still, safe sexual practices remain essential.
- Prevention of penile problems. Occasionally, the foreskin on an uncircumcised penis can be difficult or impossible to retract (phimosis). This can lead to inflammation of the foreskin or head of the penis.
- Decreased risk of penile cancer. Although cancer of the penis is rare, it's less common in circumcised men. In addition, cervical cancer is less common in the female sexual partners of circumcised men.
Cons
- The foreskin might be cut too short or too long
- The foreskin might fail to heal properly
- The remaining foreskin might reattach to the end of the penis, requiring minor surgical repair
http://www.mayoclinic.org/tests-procedures/circumcision/basics/why-its-done/prc-20013585