The most common type of lip balm is made of petroleum jelly, or vaseline. And while vaseline is effective in sealing your skin through a protective film, it also prevent it from exchanging oxygen and moisture with the environment. The somewhat paradoxical result could be dry lips.

A valid alternative could be beeswax. The sealing effect is there as well, but with the benefits of propolis. And of a lower possibility of allergic reactions. Quite worth a try.