That itchy, red rash between your toes -- that's a sign of athlete's foot. If untreated, it develops into cracked, blistered skin that may become infected with bacteria. The rash can also spread to the toenails, soles, and sides of the feet.
Typical symptoms of athlete's foot also include dry, flaking skin on the soles of the feet.
You should treat athlete's foot at the first sign of itchiness or redness between your toes. If it spreads to the toenails, eliminating it will be more difficult.