A 6-month-old boy was treated for lead poisoning due to the use of the cosmetic known as "tiro," which is used as a folk remedy for promoting visual development, according to a report of the boy's case released today.

The baby was brought to Boston Children's Hospital with elevated levels of lead in his blood in June 2011, according to the report from researchers at the Centers for Disease Control and Prevention (CDC). The boy was born in the U.S. to Nigerian parents.

An investigation revealed the source of lead to be tiro, a powdery Nigerian cosmetic that had been applied to the infant's eyelids. Investigators had examined the family's home and found it was "in excellent condition, without lead hazards," according to the report. The baby was exclusively breast-fed, and was not given spices or supplements.

The powder was 82.6 percent lead, the report said.

The main source of lead poisoning in the U.S.