Congenital Dermal Melanocytosis (Mongolian Spot) Workup

Updated: Mar 22, 2019
  • Author: Abdul-Ghani Kibbi, MD, FACP; Chief Editor: Dirk M Elston, MD  more...
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Laboratory Studies

Usually, laboratory studies are not indicated except when extensive Mongolian spots are present. In these circumstances, it is advisable to evaluate the patient for inborn errors of metabolism in order to avoid irreversible organ damage. [46]


Imaging Studies

In extensive Mongolian spots involving the back, radiographic studies are needed to rule out a spinal meningeal tumor or anomaly.


Histologic Findings

Dendritic melanocytes with variably pigmented melanosomes typically are located in the deep reticular dermis. The melanocytes usually are oriented parallel to the epidermis. In contrast, the melanocytes in blue nevi are denser in number and more focally aggregated.