[medical citation needed] In some case studies of tinea versicolor, pain and burning result from fungicide application.

In a review of placebo-controlled trials, undecenoic acid was deemed efficacious, alongside prescription azoles (e.g., clotrimazole) and allylamines (e.g., terbinafine[6]).

[7] In terms of the mechanism underlying its antifungal effects against Candida albicans, undecylenic acid inhibits morphogenesis.

[citation needed] Undecylenic acid is approved by the U.S. FDA for topical route and is listed in the Code of Federal Regulations.

[8][non-primary source needed] McLain N, Ascanio R, Baker C, et al. Undecylenic acid inhibits morphogenesis of Candida albicans.