Finger burns that turn black indicate a relatively severe burn, likely second-degree or worse. It is crucial to immediately rinse the burn with cold water or running cold water for at least 30 minutes to lower the temperature and alleviate pain symptoms. After initial treatment, seek further medical assistance at a hospital for procedures like disinfection, burn ointment application, or wrapping with gauze for protective treatment. If the pain is significant, oral painkillers such as acetaminophen or celecoxib can be taken for pain relief. If oral painkillers are ineffective, pain relief medication may be administered via muscle injection. Antibiotics may also be needed to prevent infection. Additionally, it is advised to receive a tetanus antitoxin injection as a preventative treatment against tetanus. Under a doctor's supervision, dressings should be frequently or daily changed to promote healing of the burn. Drink plenty of water, consume more vegetables and fruits, and avoid spicy foods to facilitate the recovery of the injured finger.