How does the root of newborn fingernail blacken to return a responsibility

Neonatal fingernail root blackening needs to be alert to the possibility of hypoxia, so it is necessary to observe whether the lips are cyanotic, whether there is dyspnea, shortness of breath, even consciousness disorder and other manifestations. Some babies may be due to severe lung infection and congenital heart disease caused by hypoxia, so the cyanosis at the end of fingers generally needs oxygen inhalation and other symptomatic treatment. The symptoms can be gradually relieved. However, it is necessary to actively improve the relevant examinations to clarify the specific causes. The second possibility is that subcutaneous bleeding caused by local nail injuries, so it shows blackening.