16 May 2019 Some babies have a so-called Mongolian spot at birth. It is: Located on the back and buttocks; Slate-coloured; More or less extensive. It is common in black and Asian babies. It is rarer in white babies. Among these, it is more common in brown skin. Over time the Mongolian spot becomes less evident and eventually disappears . This article was written with the support of physicians and other clinical professionals from the Hospital da Luz network. The content published in the Health Guide is intended for the general public and is provided for informational and educational purposes only. It does not replace individual medical assessment, diagnosis, or personalized clinical advice from a qualified healthcare professional. The content is produced or reviewed by physicians and other healthcare professionals at Hospital da Luz and is based on the knowledge available at the time of publication or the most recent update, as indicated at the beginning of each item.