Phyllis
I have had the same problem with my left big toenail for a couple years and have tried several over the counter medications but to no avail. Someone in my fibro support group suggested that I try tea tree oil. I ordered a bottle from a website and have used it full strength twice daily on my nail and it is now forming new nail at the base and is reattaching to the nail base. Tea tree oil is not very expensive and a little goes a long way. I think it has worked wonders on my nail and will continue to use it until the whole nail is healthy and not discolored.