Canesten Solution is used to treat fungal skin infections such as ringworm, athlete’s foot, fungal intertrigo and fungal infections of the outer and middle ear. If you are unsure whether you have one of these fungal skin infections, seek the advice of your doctor or pharmacist. The solution is particularly suitable for use on hairy skin. The active substance in Canesten Solution is clotrimazole. Clotrimazole belongs to a group of medicines called imidazoles and is an antifungal agent which fights the cause of fungal skin and ear infections.