After playing ball, there is something resembling black bruising under the toenail.
Nov 29, 2025
Source: Cainiu Health
Dr. Liu Wenmin
Introduction
After playing sports, if a black, blood-like substance appears under the toenail, it is usually a bruise caused by subungual hemorrhage. This occurs when the toes are compressed or impacted during physical activity, leading to rupture of capillaries in the nail bed, and is often accompanied by mild swelling or pain. If the bruised area expands rapidly, severe pain develops, or the nail becomes loose, prompt medical attention is recommended.
After playing ball games, if a black, blood-like substance appears under the toenail, it is usually a bruise caused by subungual hemorrhage—bleeding beneath the nail. This occurs when the toes are compressed or impacted during physical activity, leading to rupture of capillaries in the nail bed. It is often accompanied by mild swelling or pain. If the bruised area expands rapidly, severe pain develops, or the nail becomes loose, medical attention should be sought promptly.
The black substance resulting from subungual hemorrhage is coagulated blood, which gradually moves toward the fingertip as the nail grows and eventually falls off naturally with nail trimming. Mild subungual bleeding does not damage the nail bed or affect new nail growth, and typically requires no special treatment—only proper care is needed.
If significant swelling occurs due to extensive bruising, apply cold compresses within the first 48 hours to reduce swelling and pain. After 48 hours, switch to warm compresses to promote absorption of the blood. Avoid pressing on or puncturing the nail to prevent bacterial infection and conditions such as paronychia.
In daily life, wear loose, breathable shoes and socks to avoid toe compression. Temporarily reduce intense physical activities, especially running and jumping. Keep feet clean and dry, and avoid cutting nails too short. Allow the bruised blood to naturally grow out and shed with the nail.
