Medically it is known as cheilitis. It's caused by several things.Mostly
people known that it is fact of licking their lips during cold weather
and they use Vaseline or chap stick in winter.
Skin on the lips is most sensitive then the skin on the eyes.Excessive
licking also caused the chapped lips.Thousands of people have habit to
licking their lips regularly.This routinely licking can caused skin
irritation around the mouth.
Mostly children are the addicted of this habit.
Moisturize Lips:
Skin of the lips are most sensitive then the skin of the body. We give
a lot of time to our body and face skin but remember moisturize your
lips consistently can prevent you from the chapped lips.
Moisturize lips with a natural ointment is better then applying
Vaseline or chap stick.