Why is the bridge of the nose and the area between the eyes noticeably darker

Patient's question:

Half a year
Duration of this illness and its persistence: Nearly two months
Dear Experts,
My daughter is three and a half years old. For the past two months, we suddenly noticed that the area on her face between her nose bridge and the space between her eyes (similar to the white patch on the nose of a clown in Peking Opera) has become noticeably darker than the rest of her face, appearing almost blackish-yellow. Under her lower eyelids, we can see the lower edge of this colored area, with a clear boundary line. I don’t know why this is happening. Some people say it reflects poor liver health, while others suggest malnutrition. I’m very worried. Could you please explain what this could be?

Doctor's answer:

Hello, after reviewing your symptoms, it is recommended that you use acne capsules for treatment, as it is a Chinese herbal medicine with fewer side effects.
Recommendations: Avoid spicy, sweet, fried, and baked foods. Do not consume allergenic foods such as seafood or mutton. Use an umbrella when going outdoors to protect against ultraviolet rays. Wishing you good health.
The causes of pediatric endocrine disorders are numerous. If a child is diagnosed with a pediatric endocrine disorder, parents should cooperate with the doctor in active treatment, support gastrointestinal decompression, and develop good hygiene habits. Parents should pay attention not to develop picky or selective eating habits in their children and maintain a balanced diet.