Black under the toe nail

The big toe nail on the foot is black, and the following conditions should be considered: 1. Trauma factors: If the finger (toe) nail is suddenly blackened, it is necessary to consider whether there is bleeding under the nail caused by trauma. This situation does not require special treatment, mainly observation. 2. Infection factors: bacterial infection and fungal infection, which can show this situation. To do relevant inspections to be able to judge. 3. Melanoma: This is the most serious case. Melanoma is a malignant tumor, nails show striped black spots, the color is getting darker and darker, the range is getting wider and wider, it is necessary to be particularly vigilant whether melanoma. Therefore, fingernails, toenails show sudden blackening, and there is no cause of trauma, must go to the hospital dermatology department to see a doctor, in order to judge and timely treatment.