Abstract
A healthy one-year-old girl presented with onychomycosis in the left foot unilaterally, with the toes and all fingers affected. Five months prior to the onset, she had a history of toenail injury. As two months of topical ketoconazole treatment showed no improvement, topical efinaconazole was selected as an alternative to alleviate symptoms. Although onychomycosis in children is extremely rare, trauma is an important predisposing factor. However, the literature is scant. Moreover, as limited data exist on the use of efinaconazole in children younger than six years of age, this case is the first report to suggest its efficacy and safety in a one-year-old infant.