Male Genital Mutilation is an accurate description of the practice of male circumcision.  A parallel to Female Genital Mutilation, both are generally performed for similar social and dubious health benefits.  Any alteration of the normal genitals of male infant is mutilation, which is defined as:

Mu·ti·late, transitive verb mutilated -·lat'ed, mutilating -·lat'ing

1. To deprive of a limb or an essential part; cripple.
   
2. To disfigure by damaging irreparably.
3. To make imperfect by excising or altering parts.