Black or darkened toenails are essentially bruised nails and can result from a variety injuries or problems. Darkened nails may occur as a result of the toe hitting the end or the top of the shoe toe area. Sometimes, the bruise can lead to a fungal nail infection.
Treatment may include trimming the nail back and applying a topical antifungal medication. If the skin under the nail is ulcerated, a topical antibiotic ointment should be applied.
Diabetic patients should contact our office for evaluation if they experience any change in the color of toenails. The pressure causing the bruised nail may lead to a small sore under the toenail, which can lead to infection.