Itching on the back of the feet, this situation is considered for two reasons, the first allergy caused by eczema-like dermatitis of the skin or contact dermatitis caused by. This approach to avoid scratching, you must take topical or drink oral medication for treatment, topical including harcinexide, compound tretinoin acetate solution, dextran ointment, mometasone antacid ointment and other topical, twice a day for treatment, with oral cetirizine or paracetamol and other simultaneous treatment when the symptoms are heavy, and then to avoid spicy diet. If the shoes are rubber or of a quality that can easily lead to allergies, you can replace a pair of shoes. Another cause may be tinea pedis, which then spreads to the back of the foot and forms tinea corporis resulting in itching, like this case first to avoid scratching, second to antifungal treatment, topical application of dacrynic acid terbinafine hydrochloride ointment, etc., antipruritic and antiseptic treatment, twice a day, for a total of about four weeks.