We report a 2-year-old child who presented with severe methemoglobinem
ia after topical application of Lanacane (with 3% benzocaine). The exp
erience with our patient shows that intoxication can occur in children
if the drug is applied to a large area of skin that has lost its inte
grity. We discuss the usefulness of the pulse oximeter in making the d
iagnosis and review the management of methemoglobinemia.