Sudden swollen itchy feet can be due to allergic reaction. You can apply an anti-itch cream
or lotion to the affected area. Oral antihistamin
e, such as Benadryl can also be used. You should take a comfortably cool bath and wear smooth-textured cotton socks. You should choose mild soaps without dyes or perfumes and use a mild, unscented laundry detergent when washing clothes, towels and bedding.
Please take a second opinion from a dermatologist if the symptoms persist.