Vaseline on the nostrils is actually common in clinical practice, but the Vaseline used in medical practice is sterilized, strictly disinfected Vaseline. When a nose bleeds, the gauze is filled with Vaseline, and when sinus surgery is done, the sinuses are opened and the nasal cavity is filled with Vaseline, but some hospitals now use better filling materials such as hemostatic sponges. Vaseline can also be used to lubricate the nasal cavity and prevent nasal dryness. Of course, petroleum jelly or to emphasize the medical, after sterilization treatment can be used, not just buy the market can be used, I hope you distinguish clearly.