A 33-year-old male healthcare worker in an intensive care unit had horizontal grooves on all his nails. These grooves were 4 mm from the proximal nail fold (Figure 1). Four months ago, in the course of his work, he developed a fever, cough, diarrhea, arthralgia and hyposmia for eight days, but did not require hospitalization. He was ultimately diagnosed with COVID-19 through a positive nose swab PCR test. He had no traumas or other concurrent febrile disease.

Figure 1
Beau lines: Horizontal grooves (arrows) 4 mm from the proximal nail folds.

Beau lines are caused by a temporary interruption of the growth of the proximal nail matrix ¹. They generally occur after episodes of cardiac arrest, chemotherapeutic agents, febrile illnesses, trauma and Raynaud's disease ². Since the beginning of the COVID-19 pandemic, reported dermatological findings have included maculopapular, vesicular and urticarial rashes ³. This image is an invitation to actively seek a new spectrum of COVID-19 manifestations.