If your heels are not cracked into the flesh, rub some castor oil on your feet after each shower/bath. Not so much that you slip when walking on tiles, just enough for your feet and you to know. I add some Rosewood, lemon and sandalwood essential oils. Again - very little.
This same recipe also cured my athletes foot.
I am not the barefoot herbalist, but saw your question, and thought I would share my experience.