How come my foot itch?

I don't know why: Your feet itch. A visit to your physician or dr can help to find out. Causes for itching of feet can include fungi called dermatophytes (ringworm, athlete’s foot); dyshidrosis (a form of eczema); neuropathy (i.e., diabetic); hookworm; vitamin deficiencies; scabies; poor circulation; pregnancy; cholestatis, dry skin, chilblains; contact dermatitis etc.

Acute athlete's foot: The first thing that comes to mind is that this is one of the presentations of acute athlete's foot. Use drying soaks (epsom salts or dilute vinegar) and a topical antifungal... I prefer patients use lotrimin ultra or Lamisil (terbinafine) cream. You can use certain-dry pads or solutions to decrease perspiration. If this doesn't work, see a podiatrist and be sure to inform them of what you have tried already.