"Where did you get information that suggests the Athletes Foot fungus exists in your blood?"
From a physician.
Also note the post in this forum: Re: athlete's foot is an internal problem not external.
which reads in part: "...it's about your health not what you see on your feet. an external warning about an internal problem."
If you are susceptible to athlete's foot, only internal treatment will kill it and even that isn't 100% However, I'm cured through urine therapy, - cheap, easy and fast. No topical applications, no worry about moisture, none of the headaches associated with all the information given in conventional wisdom. Not saying that won't work for some, but it never worked for me no matter how hard I tried.