Possible causes may be Too much sun exposure resulting in dry lips and dark patches
High intake of caffeinated beverages, such as, tea or coffee
Consumption of hot food
Biting and licking the lips constantly
High levels of iron in the body
Vitamin B deficiency
Changes in hormone levels
Allergic reactions to toothpaste and products applied on the lips
Allergic reaction to lip medication...Consult nearest dermatologist they will help you further
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