Topical efinaconazole 10% solution is known to be an efficacious and safe treatment modality for toenail onychomycosis. This study will examine the compatibility of topical efinaconazole and nail polish in patients with distal and lateral subungual onychomycosis (DLSO). It is hypothesized that the treatment of DLSO with efinaconazole 10% solution will not be adversely affected by the application of nail polish.