Years ago I had a verruca and picked up Bazuka that I'd bought months before for my daughter. After reading it wasn't suitable for diabetics, I saw my GP who prescribed a similar product. On the instructions it stressed it should only be used on affected skin. I used it on the verruca and it spread down to healthy skin, so I wiped it off and used the Bazuka which was thicker and did not spread to healthy skin. As long as you use it only on affected skin you should be ok. However, if you have loss of sensation in your feet, you should visit a professional for treatment