First Day as Personal Trainer Ruined by Relentless Athlete’s Foot Itch During Client Workout

I was hired for the personal training job and it's my first day of training. i am working with a client and feeling the itch grow as the workout progresses. first it starts subtle with trying to get to the itch as i demonstrate different workout pieces.squats, lunges, pushups etc. cam on the floor showing me from the ground up. i am shuffling my feet, rubbing my foot on back of my leg, grinding my other foot on top of my toes trying to relieve the itch. as it grows, i am sliding my shoe on/off to get at the itch.after a few mins, my shoes come off for better squat balance...and i am scratching at my toes with every squat. i finally admit that i have athlete's foot, and how it's driving me nuts... the itch is getting me and very annoying it is.