Clofazimine-induced skin pigmentation

A 54-year-old male presented to the outpatient department with complaints of black discoloration of skin and nails for the past 1 month. The patient gave a history of multi-drug resistant sputum positive tuberculosis for which he is on antitubercular drugs (Isoniazid, Ethambutol, Pyrazinamide, Clofazimine, Bedaquiline, Levofloxacin, and Ethionamide) for the past 9 months. A dermoscopy was done which showed yellow globules in a honeycombing pattern and hyperpigmentation with sparing of the sweat glands. A diagnosis of Clofazimine-induced hyperpigmentation was made. As a Physician, with tuberculosis nearing elimination, monitoring and managing the adverse effects of drugs is important. Clofazimine is a riminophenazine dye that has both anti-microbial and anti-inflammatory action. It is absorbed orally and is known to accumulate in tissues. It has a very long half-life of about 70 days and is excreted in small amounts in bile, urine, and sweat. It is used in leprosy, multidrug-resistant tuberculosis, lepra reaction, and in other mycobacterial infections. Clofazimine-induced pigmentation is reversible but takes months to years to clear after stopping the drug.