How to know if something is athletes foot or just dead skin?

See physician: A Podiatrist or Dermatlogist should be able to diagnose and treat a simple case. Sometimes a fungal culture or submiting a sample of affected skin may be needed. Is there any redness or itching, peeling present. This is often associated with fungus: especially if your feet sweat a lot or do not get enough air.

Athletes feet : Athletes feet usually itches more than dead skin.