Erythema gyratum repens (EGR) is a rare paraneoplastic skin condition characterized by the eruption of expanding, concentric, erythematous patches and plaques. The condition may precede a symptomatic appearance of internal malignancy, and therefore provides a unique opportunity to prevent additional morbidity and mortality secondary to undetectable cancer growth. We report the case of a 71-year-old female patient clinically diagnosed with EGR and subsequently diagnosed with otherwise asymptomatic adenocarcinoma of the lung.