What's wrong with purple fingernails?

Purple fingernails may show nail bed lesions, vascular lesions, etc. 1. Nail bed lesions. If the purple color is shown alone, it may be a nail-mother nevus. It may also be a capillary rupture bleeding after external pressure on the nail. After local oxidation, the bleeding is purple fingernails. 2. Vascular lesions. Generally showing local vascular lesions, local blood circulation disorders, but also often showing swelling of the palm fingers, pain. If all nails appear purple, it may be cyanosis caused by hypoxia and low oxygen content in red blood cells. It may also be due to poor peripheral circulation caused by anemia, which makes the appearance of fingernails appear purple.