Herbal Skin Doctor Heel Balm". It is designed to treat rough, dry, and cracked feet. The balm contains 25% urea, which helps moisturize and break down hard skin. It is intended for use on the heels, but can also be used on other dry areas of the body like knees, elbows, and hands. The balm is applied twice daily, morning and night, to clean and dry feet. For best results, it is recommended to wear socks after applying the balm to lock in moisture.