Patients with black nails are usually not self-absorbing and can gradually fall off as the nail grows, usually taking 3-6 months, but there is some individual variation because each person’s nail growth rate is different. The black color that appears after the nail is clipped is mainly due to the rupture of blood vessels under the nail, i.e., clotting. Usually, as the nail grows, the blood clot will gradually fall off and when the nail is completely renewed and metabolized, the black blood clot will disappear completely. Fingernails generally grow faster, while toenails grow slower and take about 3-6 months to fully recover. If a patient’s nail becomes loose when it is clipped, or even if the distal end of the nail buckles and the nail bed partially falls off, it is recommended that the patient go to the hospital for general surgery to have the nail removed and treated with anti-inflammatory treatment to avoid secondary infection. Patients should avoid hot water immersion during nail recovery and can choose cool water rinsing or cool water immersion to achieve the purpose of stopping bleeding, otherwise it will easily lead to nail peeling and affect the speed of nail recovery.