Map tongue, also known as wandering tongue, is a superficial, non-infectious form of tongue inflammation called map tongue because its presentation resembles the meandering borders of countries on a model map. The location and shape of the lesions in map tongue can vary. Map tongue can develop at any age, but is most common in children, and may disappear with age, and is often accompanied by furrowed tongue in adults. The factors of the onset of map tongue are not particularly clear: 1. It may be related to mental factors, such as insomnia, fatigue, emotional fluctuations caused by 2. endocrine factors. 3. nutritional factors, including indigestion, vitamin B deficiency, vitamin C deficiency. 4. and local factors, the eruption of the milk teeth is also related to a certain extent. When the whole body appears seborrheic dermatitis, allergic diseases, infectious lesions, etc., may also appear map tongue symptoms.