Whether to cut off the skin after a finger burn depends on the specific circumstances and cannot be generalized. It depends on the cause of the finger burn. If the burn is caused by relatively clean boiling water, the skin does not need to be cut off after disinfection. The skin acts as a protective layer, similar to a dressing, which can reduce contact with foreign objects and minimize damage to the burn from external particles or foreign objects, therefore providing certain protection. However, if the burn is caused by contaminated substances, such as lime, and the finger is contaminated, the previously burned skin should be cut off. After cleaning, it is considered a foreign object that could potentially worsen an infection.