Fungal nail infections don’t usually lead to serious long-term problems when properly treated, but they may be more serious in certain individuals. This can include people with diabetes or who have a weakened immune system and have trouble fighting off an infection. Even if there is no pain associated with the infection, it is important that you promptly visit your doctor for assessment if you see any abnormal nail changes.
If you have diabetes, you may have reduced blood circulation and nerve supply in your feet. You're also at greater risk of a bacterial skin infection (cellulitis). So any relatively minor injury to your feet — including a nail fungal infection — can lead to a more serious complication. See your doctor if you have diabetes and think you're developing nail fungus.