I have red rash on my foot, from mascot costume. really itchy., what is this and treatment?

See podiatrist: You description sound like an athletes foot fungus. Try otc medication.

Red rash: It could be tinea - or athlete's foot fungus , but it could be a contact dermatitis. /see your podiatrist for assistance. Good luck.

It could be...: Athlete's foot. The best otc medication (in my opinion) is lotrimin (clotrimazole) ultra. Dilute vinegar soaks are good as well. Dry the inside of your shoes by placing them up-side down over an air return vent at home overnight. If this doesn't make things better in a couple days, see a podiatrist.