What to do if a child has a map on his tongue?

What to do if a child has a “map” on his tongue?

Some children often have irregularly shaped plots on the tongue surface. The tongue in the plot is red and there is no tongue coating. The tongue mucosa around it is gray and white, like a map, so it is called “map tongue” .… A letter from Mr. Wei Chaojin of Hechi, Guangxi said that his young granddaughter found a “map tongue” shortly after he was born.
The beginning is to produce some small white spots from the base of the tongue, and then gradually spread until the tip of the tongue disappears naturally.
After repeated occurrences.
I went to the hospital for an examination and said that it was caused by a zinc deficiency. I prescribed zinc gluconate for a while, but it returned to the original state soon, and the diffusion period was about 2 months.
My granddaughter is 2 years and 4 months old. What should I do?
  Some children often have irregularly shaped plots on the tongue surface. The tongue in the plot is red and there is no tongue coating. The surrounding tongue mucosa has a gray-white bulge, which looks like a map, so it is called “map tongue”.Medically it is called “benign nomadic glossitis”.
The lesions can fuse with each other and often change positions.
  Map tongue is a more common symptom in children 4-5 years old.
After the map tongue appears, there is usually no major pain, but it is often accompanied by poor appetite, thin yellow muscles, night sweats, night stools, constipation or constipation, and colds.
  The cause of the map tongue should be vitamin deficiency or glossitis.