Have you ever used a lip scrub?  It is just like a body scrub but it is especially made for your lips.  Once the dry skin is removed from your lips , it helps with the lip balm to absorb better.  Granulated sugar is the perfect lip exfoliant because it is a lot gentler than salt but is scrub plus it takes good.  To learn more about making a lip scrub, check out this Floral Sugar Lip Scrub recipe from The Soap Queen.