A 5 year old boy with a circular red in the middle of his tongue may have map tongue, which may be associated with indigestion, nutritional deficiencies, odontogenic lesions, and other factors. Circle red in the middle of the tongue is also known as the surface of the tongue with the area of tongue papilla peeling off, presenting a round, irregular figure, the shape and location of which are subject to change, called map tongue. Generally when the body resistance is low, the patient’s irregular eating causes accumulation of food, indigestion and other symptoms, may appear map tongue. When a child is malnourished due to partiality of food, he or she may also have symptoms of maple tongue. When the child has more bad teeth in the mouth, there is a disturbance of the bacterial flora in the mouth, which can cause the tongue to have peeling papillae and have the symptoms of map tongue. In addition, there are genetic factors that cause it. Generally, there is no discomfort and no special treatment is needed. It is recommended to improve the body’s resistance, and if combined with oral infections, it is recommended to be treated with medication.