My feet have been burning for two days and it was all of the sudden they started and they sting also and are slightly red on the bottoms?

Foot pain: Since it started so suddenly, it may be irritation from excessive walking or exercise or from wearing shoes with poor arch support. You could have something called plantar fasciitis (also frequently caused by wearing bad shoes). Less likely would be a viral infection or extremely high blood sugar. Give it a few days of wearing good tennis shoes with arch support. If no better in 2 weeks see md.