Black hairy tongue is an asymptomatic and benign condition presenting with black-to-brownish discoloration of the dorsum of the tongue with elongated filiform papillae. Several medications, particularly antibiotics, are implicated in its causation. Xerostomia, abnormal desquamation of the tongue, use of oxidizing mouthwashes, excessive intake of nicotine, coffee, and tea, and immunosuppressive states predispose to the development of this condition. Herein, we describe a case of a young female who developed black hairy tongue within 5 days of linezolid intake. The discoloration disappeared after 7 days of stopping the drug. We also summarize the various reports of black hairy tongue due to linezolid in a tabular form. We aim to highlight the importance of medication history in the identification of this uncommon condition. We also emphasize identifying risk factors for this condition and educating the patients about them.

Inherited palmoplantar keratodermas (PPKs) have onset in the late infancy or early childhood and have a positive family history. Sporadic cases and cases with onset in adulthood have been rarely reported. We describe two female cases with transgradiens and progradiens PPK, with onset in adulthood having clinical and histological features of Greither’s disease (GD). Only a single report of adult-onset GD has been reported in the literature. All patients presenting with palmoplantar keratoderma should be thoroughly evaluated, as it may be a late-onset inherited disorder, it adds to the spectrum of conditions to presenting with PPKs of late-onset.