Widespread miliaria crystallina in a newborn with hypernatremic dehydration.

Miliaria, which is extravasation of sweat into the epidermis and dermis due to sweat duct obstruction, is a commonly seen dermatologic disorder in newborns. We present a case of extensive, widespread miliaria crystallina that developed in a newborn during treatment of severe hypernatremic dehydration. A possible mechanism could be the destruction of sweat ducts with excretion of sweat with high levels of sodium.