I had exactly same "fungus" on mine fingers 2years ago.
3x on Antibiotics,3 different hormonal creams, dermatologists, naturopath, lots of vitamins, manuka honey, oregano oil, coconut oil, I tried all home remedies and nothing working for me. So 8 month later still " fungus" on my fingers and $ 1000 shorter in all "experimental remedies" I tried urine therapy.
3X daily for 10 minutes I soaked my fingers in my fresh urine, then washed my hand with ivory soap then softened with baby oil with vitamin E. One week later "fungus" was gone.