Thanks for the query. This presentation can be seen with many skin diseases. The best option is to consult a Dermatologist in person to understand the problem and get it diagnosed. A proper treatment can then be started. Discuss the situation and hope it will be cleared in few days. Don't delay the appointment. Hope it helps you
If this is affecting a single foot, tinea pedis has to be ruled out. Meet a Dermatologist for further help.