Mongolian spots are congenital hyperpigmented areas of varying size and shape and are usually confluent grayish-blue in color. They are found most frequently in the sacral region and typically disappear during childhood. Occasionally, they persist to adulthood.

The use of Q-switched alexandrite laser treatments for Mongolian spots and examinaton of the therapeutic outcomes of 26 Japanese patients with Mongolian spots was reported in the Dermatologic Surgery, Volume 34, Number 12, December 2008 , pp. 1689-1694(6).


A good therapeutic outcome was achieved overall, but some adult female patients subsequently developed severe postinflammatory hyperpigmentation. Sacral Mongolian spots were more laser-resistant than extrasacral Mongolian spots.


The outcome correlated with the age of patients at the initiation of treatment; therefore, sacral and extrasacral Mongolian spots should be treated before 20 years of age. To avoid severe postinflammatory hyperpigmentation, the optimal interval between laser treatments and the use of other treatment modalities including Q-switched ruby laser, Q-switched neodymium-doped yttrium aluminium garnet (Nd:YAG) laser, or bleaching creams should be considered.