Petroleum jelly in Vaseline is absolutely terrible - it is the same thing used to lubricate your car engine parts and is derived from crude oil. I would never put Vaseline on my lips
Try these... "Earth to Body" Skin Care, and I picked up a tube of Emu Oil lip balm. Its fabulous!! The ingredients are emu oil, sweet almond oil, avacado oil, aloe vera, beeswax, lavender oil, tea tree oil, lime oil and lemon seed extract. That's it! No chemicals! It goes on VERY smoothly, no tugging or waxy feeling.
Underlying causes could be various.. Systemic Candida (yeast), kidney energy imbalances, vitamin/mineral deficiencies, excessive picking, etc...
One dermatologist said that after years of picking, the skin has started to grow back thicker as the body's natural way of protecting itself. She also said, however, that in time this will work itself out, as the body continuously heals and regenerates (but people will have to be patient). And stop picking.
If anyone has ever taken excessive amounts of synthetic vitamin A or even Accutane for Acne, this will be an ongoing problem. Unfortunately, I took that when I was younger, and never had dried lips before. I'm sticking with holistic methods for everything from now on.