Disclosed are: a revolutionary anti-trichophyton agent which has an extremely superior antibacterial activity against Trichophyton bacteria, secures the complete recovery from skin diseases caused by Trichophyton bacteria such as athlete's food and tinea, and can be used for persons who are suffering from skin diseases caused by Trichophyton bacteria with satisfaction； a therapeutic material for skin diseases caused by Trichophyton bacteria, which comprises the anti-trichophyton agent； and a therapeutic tool which comprises the therapeutic material for skin diseases. The anti-trichophyton agent comprises an alkaloid compound composed of carbon, hydrogen and nitrogen and represented by molecular formula: CxHyN2 as an active ingredient.
