1. Keratitis: Keratitis refers to inflammation of the skin around the lips, which is often manifested as chapped lips, pain and redness. In severe cases, angular stomatitis may lead to melanin deposition and blacken the corners of the mouth.
2. Lead poisoning: Lead poisoning is a disease caused by long-term exposure to lead-containing substances. Lead poisoning will affect the nervous system and blood system, leading to anemia, headache, insomnia and other symptoms. In severe cases, lead poisoning may also lead to skin blackening.
3. Malnutrition: Malnutrition refers to the body's lack of necessary nutrients, such as protein and vitamins. Malnutrition can lead to dry skin, peeling, pigmentation and other symptoms, making the corners of the mouth black.
4. Allergic reaction: Some foods or drugs may cause allergic reactions, resulting in redness, itching and edema of the skin. In severe cases, allergic reactions may also lead to blackening of the skin.
If the baby's mouth is black, it is recommended to seek medical advice in time to find out the cause and treat it. At the same time, pay attention to keep the baby's diet balanced and avoid contact with harmful substances, which will help prevent the occurrence of dark circles around the mouth.