After a burn, do not apply soy sauce because it contains a high amount of salt, which can aggravate the severity of the burn. Additionally, soy sauce may not be clean and could possibly contaminate the wound with bacteria, leading to infection. However, consuming soy sauce does not significantly affect the healing of burns. The correct practice is to immediately soak the burned area with running tap water or cold water for about half an hour, then observe if there are any blisters or similar conditions. You can apply some burn moisturizing cream for further treatment. Generally, the wound should be treated with exposure therapy, and in severe cases of burns, skin grafting or flap surgery might be considered.