What should you know about toenail discoloration black?

Blood trapped under the nail can appear red, purple, brown, or black. It may happen after stubbing a toe, dropping something on it, running, or wearing shoes that press against the nail. Tenderness and pressure are common early features. As the nail grows, the discolouration should gradually move towards the tip rather than remain fixed at the base.

A dark streak or patch without a remembered injury has other possible explanations, including pigment changes or infection. A photograph taken in good light can help you compare the mark over time, but it cannot replace an examination.

Keep the toe clean and dry, choose shoes with room at the front, and avoid running or activities that increase throbbing while it is sore. Do not pierce or drain the nail yourself. Trim only loose edges that catch on clothing, and leave attached nail in place. A clinician can decide whether pressure needs treatment and whether the nail or surrounding skin needs further evaluation.

Arrange medical review when the dark area appeared without a clear injury, spreads or changes shape, reaches the skin around the nail, or does not move outward as the nail grows. Seek prompt care for severe pressure, increasing swelling, pus, fever, marked redness, numbness, or a toe that looks misshapen after trauma. People with diabetes, poor circulation, or reduced sensation should seek advice early after a foot injury.

Ask whether the pattern fits a bruise, whether the nail needs drainage, and what changes would require review. You can also ask how to protect the toe during exercise and whether the nail should be monitored as it grows.