I used to be scalded by boiling water or a pot. The first thing every time is to wash the wound quickly with cold water, and the effect is immediate. I remember one time, I thought it was useless to wash it with cold water. At that time, I applied toothpaste directly to the wound, and immediately blisters appeared.
Of course, you can also put ice on the burned area. In short, just let the wound contact with cold objects.
There are other remedies. I used to apply soy sauce and toothpaste to the wound. Although I don't know which one is useful, there is really nothing to follow up afterwards. You can also try.
Of course, if you have scald medicine at home, you can apply it directly to the wound. This is the best emergency measure. I bought that kind of spray before, and I feel quite good. Spraying it on the wound can also relieve my pain.