According to the Mexican Social Security Institute nationwide, around half of Mexican babies have the slate grey nevus.Central American indigenous children were subjected to racism due to their slate grey nevus but progressive circles began to make having the slate grey nevus popular after the late 1960s.Highland Peruvians have the slate grey nevus. Treatment
As a congenital benign nevus, Mongolian spots do not require treatment and in most cases disappear before adolescence. No cases of malignant degeneration have been reported. Cultural terminology
The slate grey nevus is referred to in the Japanese idiom shiri ga aoi (尻が青い), meaning "to have a blue butt", which is a reference to immaturity or inexperience. In Mongolian language, it is known as "Хөх толбо". Korean mythology explains the nevus as a bruise formed when Samshin halmi or Samsin Halmoni (Korean: 삼신할머니), a shaman spirit to whom people pray around childbirth, slapped the babys behind to hasten the baby to quickly get out from the mothers womb. "Mongolian Mark", the middle third of the 2004–5 novel The Vegetarian, is named after the title characters nevus, which obsesses her brother-in-law. In Chinese, it is referred to as "青痕" (Pinyin: Qīng Hén; literally: blue mark). Among common folk it is said to be caused by the Buddhist goddess of childbirth Songzi Guanyin (Simplified Chinese: 送子观音; Pinyin: Sòng Zǐ Guān Yīn; literally: the goddess of baby sending) when she is slapping the babys backside, telling it to be born.
A joint dislocation, also called luxation, occurs when there is an abnormal separation in the joint, where two or more bones meet. A partial dislocation is referred to as a subluxation. Dislocations are often caused by sudden trauma on the joint like an impact or fall. A joint dislocation can cause damage to the surrounding ligaments, tendons, muscles, and nerves. Dislocations can occur in any major joint (shoulder, knees, etc.) or minor joint (toes, fingers, etc.). The most common joint dislocation is a shoulder dislocation.Treatment for joint dislocation is usually by closed reduction, that is, skilled manipulation to return the bones to their normal position. Reduction should only be performed by trained medical professionals, because it can cause injury to soft tissue and/or the nerves and vascular structures around the dislocation. Symptoms and signs
The following symptoms are common with any type of dislocation. Intense pain
Joint instability
Deformity of the joint area
Reduced muscle strength
Bruising or redness of joint area
Difficulty moving joint
Stiffness

Causes
Joint dislocations are caused by trauma to the joint or when an individual falls on a specific joint. Great and sudden force applied, by either a blow or fall, to the joint can cause the bones in the joint to be displaced or dislocated from normal position. With each dislocation, the ligaments keeping the bones fixed in the correct position can be damaged or loosened, making it easier for the joint to be dislocated in the future.Some individuals are prone to dislocations due to congenital conditions, such as hypermobility syndrome and Ehlers-Danlos Syndrome.