I was a bartender for many years and a common ailment is a fungus developing from handling and scooping ice on your fingernails and skin from the ice. My nails and skin around the nails looked grey-ish black all the time. A friend of mine who did nails suggested I soak my fingers in witch hazel and it worked!! A simple soaking in a bowl with the witch hazel every night for about 10 minutes did the trick. Also works for toenail fungus.
I discovered recently that I have Candida overgrowth, which resulted in a brown motteling of the skin on my arms which is spreading up my upper arms due to candida. I have had this for many years and doctors never knew or cared what it was. After researching, I discovered that it is caused by my candida overgrowth. I started applying witch hazel every day to my arms, followed by sunscreen and then alternating every day with different anti-fungal creams but always using witch hazel first. You have to use different anti-fungals to kill the little creatures because they get resistant if you don't switch up. The zinc in the sunscreen also helps. It's necessary to use a cream after witch hazel because it is drying. In about 3 days I noticed the "rash" getting lighter!! I am so happy that it is working. Mine was so brown and very embarrassing. Don't take pills to destroy fungus! Use witch Hazel!