Anytime you think you have a fungal nail infection, or any nail problem, and treating it at home doesn’t help, see your doctor or podiatrist (foot doctor). The sooner you go, the sooner your doctor can help.
Fungal nail infections can get worse over time. See your doctor if you notice your nail has turned brown or black, if it suddenly hurts, or if it pulls away from the nail bed.
If you have diabetes and you notice that the look of your toenails has changed even a little, see your doctor right away to prevent the problem from getting worse.