One of the other dangers is that it should not be used on fresh burns, because as mentioned earlier, it leads to trapping of elements within it. So, it can trap the heat in the burn wound, which would actually worsen it. Also, the efficacy of using petroleum jelly for scars is doubtful. In the end, if you do wish to use a moisturizing agent, then try something more natural, like cocoa butter, shea butter, or beeswax. And when you need to treat a medical condition like a burn, it is best to use a prescribed and certified medication rather than petroleum jelly.