Black toenails

Toenails are naturally white. But sometimes due to frequent use of nail polish, nutritional deficiencies, infection or trauma, color changes occur in them. There are various reasons that cause black toenails.

Of course, some of these darkness’s will be resolved by themselves. But if the blackness of the toenails does not improve, you should see a doctor to follow up on the more serious causes that caused this blackness, especially that it is not possible to damage the toenails through chewing, etc. Therefore, its treatment should be taken seriously.

Black toenails may be caused by the following:

Underlying disease

This underlying disease can include anemia, diabetes, heart disease, or kidney disease.

Fungal infections

However, fungal infections often appear white or yellow. But due to the accumulation of their remains, the toenail may turn black. Because toenails are vulnerable to fungal infections. Due to the fact that mushrooms grow in humid and warm environments. Therefore, the feet are the best place for them to grow.


Melanoma is the most serious type of skin cancer that often appears as a dark brown, misshapen spot. Such stains can be created under the nail plate.


A toenail injury is usually caused by an injury. This injury can cause blood vessels under the nail to rupture. The resulting bleeding under the nail appears black.

When should you see a doctor for black toenails?

Blackened toenails do not need to see a specialist doctor. If this complication requires medical treatment, it depends on the primary cause of its development. Knowing this reason can help you in this decision.

On the other hand, if you do not know the cause of your black toenail, but you guess that your black fingernail is a sign of a serious disease, it is better to see a doctor.

Not all cases of toenail fungus require a doctor’s visit. However, if you have diabetes, you should see your doctor to treat black toenails.

A dermatologist can also help diagnose and treat blackened toenails. If you suspect melanoma, you should see a dermatologist. However, if your black toenails are caused by another underlying health issue, such as diabetes, you should see your doctor to treat the cause.

In general, we can say that any black fingernail or toe that does not go away on its own should be examined by a doctor to be sure.

Does black toenail have complications?

If left untreated, toenail fungus can spread to the entire foot and other parts of the body. These fungi can also cause permanent damage to the nail. Therefore, they should be taken seriously.