It is a type of benign skin spot, which appears at birth or in the first weeks of life. It is more common in Asian babies.
Its presence is due to an excess of pigmentation in an area, generally affecting the buttocks or lower back area.
They are flat spots of blue or greyish blue, with irregular edges and measure between 4-12cm / 2-6 inches in diameter. In exceptional cases where the stain is larger, it may be a symptom of a metabolic problem called Gangliosidosis type I.
The diagnosis is by exploration of the baby, and no diagnostic test is necessary.
Also, it is not necessary to carry out any treatment since it disappears spontaneously from 6 months of age.
There is no reason to worry. In routine visits to the pediatrician, the condition will be reviewed and monitored as it evolves.
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- UpToDate [Internet]. Waltham. 2017. Benign skin and scalp lesions in the newborn and young infant; [citado el 12 de julio de 2017]. Disponible en: http://www.uptodate.com/contents/benign-skin-and-scalp-lesions-in-the-newborn-and-young-infant?source=search_result&search=mancha+mongolica&selectedTitle=1~13
