If the mouth dry skin caused by dehydration, you can increase water intake, etc., if caused by lipitis, you can carry out local wet compresses, the use of glucocorticoids and so on. 1. The common causes of dry skin on the mouth include lack of water, usually should increase the intake of water, drink water regularly, etc., when the skin is serious, you can use lip balm to alleviate the phenomenon of dry lips. 2. If there is lipitis, there will be the phenomenon of flaky lips, which can be caused by a variety of factors. First of all, you need to remove the possible irritating factors such as lipstick, you can carry out local wet compresses such as boric acid solution to relieve, you can also use glucocorticoid ointment such as tretinoin cream. If infection is present, antibiotics such as gentamycin ophthalmic ointment can be used. If the mouth peeling phenomenon is serious, go to the hospital in time, the use of the above drugs need to follow the doctor’s instructions.