My right foot, at the back just above the sole. where there are folds is dry flakey and extremely itchy! and red. what could it be? athletes foot? thx

Dermatitis: Which is a fancy name for irritated skin and that is a common area to be irritated- whether form dry skin or shoes rubbing . Try using shea butter there regularly and see if that helps. If it continues see a podiatrist...Athletes foot is more typically on the soles and toes than the area you describe.

Itchy skin: Athlete's foot can present as itchy, flaky, red skin, but also there are other skin conditions that can look like that. See a podiatrist so you can be evaluated and receive treatment.