Thank you Judy for asking the question. 
First of all we need to know what’s wrong with your feet? What’s the problem? after diagnosing the condition, sometimes in order to diagnose, if the clinical appearance of the lesion is not clear, the skin specialists order a skin biopsy. After diagnosing the condition we can start you on a specific treatment. I think here you need to see a dermatologist. If it is Eczema or Psoriasis, or any other condition, i am hopeful that it can be treated with simple foot care and some topical creams and oral tablets. I won’t allow you follow internet home recipes to self-treat your feet at home. See a dermatologist for once and get rid of your problem for life. take time of dermatologist, ask him questions, follow his advice. 
Thank you. 
Dr. Adil Ramzan
MBBS, MD Internal Medicine.