<s>[INST] Hello,My big toe nail turns black and about every year or so it seems to rot and falls off. Always grows back and soon starts to turn black again and falls off.What can I out on it to prevent it from turning black again? No pain but something not right,Thanks very much,DAN YYYY@YYYY [/INST] Treatment for a fungal nail infection includes using medicines and possibly removing the affected nail.A combination of oral antifungal medication such as Griseofulvin and antifungal nail lacquer. These treatments are brushed onto the nail in the same way that you would apply nail polish. </s>