Gingival Fistula Associated With Pulmonary Nocardiosis.

A 71-year-old man receiving prednisolone was diagnosed with pulmonary nocardiosis caused by Nocardia veterana and presented with a painless gingival fistula without an apparent odontogenic source. The fistula resolved with antimicrobial therapy alone, suggesting a possible association with nocardiosis and highlighting an unusual oral manifestation.