It is difficult for me to advise you about these sores without being able to see your daughter. She may have recurrent cold sores which are caused by a viral infection or a condition called lick eczema. It would be very unusual for a 4 year old girl to have a vitamin deficiency causing these sores with all the vitamin B supplements that children get daily in cereals and with a good diet.It would be a good idea to ask your doctor to see her.
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