Demodicidosis in a child with leukemia.

A 2-year-old girl developed acute lymphoblastic leukemia at the age of 9 months. She was treated successfully with chemotherapy but developed a pruritic, papulopustular facial eruption that was caused by Demodex folliculorum. The eruption cleared after treatment with one overnight application of 5% permethrin cream. Demodicidosis should be included in the differential diagnosis of facial eruptions in children who undergo chemotherapy and in those with congenital or acquired immunodeficiency.