Treatment for onychomycosis topically applying salicylic acid, optionally in combination with a retinoid

A method and a medicament for treating onychomycosis. The active ingredient is salicylic acid or a salt, ester or mixture thereof in a medicament, such as a plaster preparation or a liquid preparation, optionally with a retinoid compound such as tretinoin, adapalene, manoalide, retinol, tretinate or mixtures thereof. The method comprises topically administering the active ingredient to the afflicted nail. The medicament is applied without drilling holes in the nail or periodic scraping of the nail and in the absence of an imidazole antimycotic compound.