What is the reason for the white circles on a child's tongue?

Patient's question:

Age
Detailed medical condition and purpose of consultation: Recently, due to a cold and poor diet, I noticed two or three small white spots on my tongue yesterday, with redness in the center, resembling inflammation.
Duration of the current illness: Two or three days
Current general condition: No abnormalities found
Medical history: None
Previous diagnoses and treatment history and outcomes: None
Auxiliary tests: None
Other: None

Doctor's answer:

Indigestion, poor appetite, and disharmony between the spleen and stomach can easily lead to malnutrition. Chinese medicine can help regulate this and prevent recurrence. Generally, pediatricians recommend a balanced diet and supplementing with vitamin B, etc.
If it's only white tongue coating without other abnormalities, it can be temporarily monitored. This is also an individual difference and does not require treatment.
Some people scrape off their tongue coating, but this does not mean the disease has healed. If there is a disease, the tongue coating is just a symptom of the condition, which does not affect health itself. Scraping off the tongue coating is like "burying the head in the sand."