It is never a simple matter to find the cause of this form of cracking of the skin in the corners of the mouth. In many cases in children it is due to mouth breathing.It is seldom due to a vitamin or mineral deficiency.If your son's nose is blocked use Salex nose drops morrning and night to clear his nose.It may be useful to give your son a good Multivitamin with iron such as Vidaylin syrup twice daily. Apply a little zinc cream at night to his lips where they are cracked.
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