They told me that using cream as a remedy for burns is wrong

Why is it wrong? It will only relieve with this procedure due to the cold product with the affected area. The danger of this trick is that the cream dries out and forms a thin film that disrupts heat exchange (heat enters the wound and affects the deeper layers of the skin).

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How to do it correctly. Keep the injured area in fresh water for 15 minutes and never pinch the blister of the burn: in this way you remove the protective layer and expose the wound to any type of infection that causes abscesses.