are usually caused due to dehydration
It is not necessarily always as a result of heat, as even cold
and dry air can lead to lips getting cracked and chapped. This can be very easily resolved by the application of petroleum jelly. The jelly seals the pores of the lips, trapping in the moisture, thus leading to the lips staying moist and supple.
In other cases, there are medical problems that manifest as dry and chapped lips.
Apart from the weather, a vitamin deficiency
could be the cause for dry lips.
Dry lips are usually a symptom of a deficiency of vitamin B2.
People who have calcium deficiency
may also display cracked lips.
Adequate hydration is the first line of defense against chapped lips
Try applying petroleum jelly for a few days and check for improvement before you schedule a doctor’s appointment. You can also use some oils such as olive and coconut oils or essential oils on your lips.
Hope this will help you.