Kikuyu girls cut each others vulvas in the 1950s as a symbol of defiance, in the context of the campaign against female genital mutilation in colonial Kenya. The movement came to be known as Ngaitana ("I will circumcise myself"), because to avoid naming their friends the girls said they had cut themselves. Historian Lynn Thomas described the episode as significant in the history of FGM because it made clear that its victims were also its perpetrators. Classification
The term "self-mutilation" occurred in a study by L. E. Emerson in 1913 where he considered self-cutting a symbolic substitution for masturbation. The term reappeared in an article in 1935 and a book in 1938 when Karl Menninger refined his conceptual definitions of self-mutilation. His study on self-destructiveness differentiated between suicidal behaviors and self-mutilation. For Menninger, self-mutilation was a non-fatal expression of an attenuated death wish and thus coined the term partial suicide. He began a classification system of six types:

neurotic – nail-biters, pickers, extreme hair removal and unnecessary cosmetic surgery. religious – self-flagellants and others. puberty rites – hymen removal, circumcision or clitoral alteration. psychotic – eye or ear removal, genital self-mutilation and extreme amputation
organic brain diseases – which allow repetitive head-banging, hand-biting, finger-fracturing or eye removal. conventional – nail-clipping, trimming of hair and shaving beards.Pao (1969) differentiated between delicate (low lethality) and coarse (high lethality) self-mutilators who cut. The "delicate" cutters were young, multiple episodic of superficial cuts and generally had borderline personality disorder diagnosis. The "coarse" cutters were older and generally psychotic.
For example, if a speech center of the brain such as Brocas area is damaged, problems with speech are common.Focal injuries include the following:

Cerebral contusion is a bruise of brain tissue that commonly results from contact of the brain with the inside of the skull. Cerebral laceration is a brain injury in which the pia-arachnoid is torn. Epidural hemorrhage is bleeding between the dura mater and the skull. It is commonly associated with damage to the middle meningeal artery, often resulting from a skull fracture. Subdural hemorrhage is bleeding between the dura mater and the arachnoid. Intracerebral hemorrhage is bleeding within the brain tissue itself. Intraventricular hemorrhage is bleeding within the ventricles of the brain. Diffuse
Diffuse injuries, also called multifocal injuries, include brain injury due to hypoxia, meningitis, and damage to blood vessels. Unlike focal injuries, which are usually easy to detect using imaging, diffuse injuries may be difficult to detect and define; often, much of the damage is microscopic. Diffuse injuries can result from acceleration/deceleration injuries. Rotational forces are a common cause of diffuse injuries; these forces are common in diffuse injuries such as concussion and diffuse axonal injury. The term "diffuse" has been called a misnomer, since injury is often actually multifocal, with multiple locations of injury.Diffuse injuries include the following:

Diffuse axonal injury is widespread damage to the white matter of the brain that usually results from acceleration/deceleration types of injury.