Dapsone-induced Methemoglobinemia in a patient with history of Lichen Planus: A case report

This is a case of a 51-year-old patient with a history of lichen planus on dapsone having methemoglobinemia, with G6PD blood levels that are on the lower range. The primary focus of the case report is on the mechanism of dapsone-induced methemoglobinemia along with a discussion over methemoglobinemia, its signs and symptoms, diagnosis, and the line of treatment for the same. Methemoglobinemia could be fatal if left undiagnosed and not treated on time.