There is a strong correlation with genes for a 9-year-old girl to have bad fox odor. For milder cases, the symptoms can be relieved by paying attention to personal hygiene, paying attention to diet and applying medication. 1. Pay attention to personal hygiene: Fox odor is mostly related to factors such as high secretion of sweat, bacterial reproduction to decompose sweat, and consumption of food with strong odor. Therefore, people with mild disease should pay attention to personal hygiene, change clothes and take bath frequently, and keep the armpits clean and dry. 2. Pay attention to diet: patients should avoid eating garlic, onions and other spicy stimulating food, to avoid stimulation to increase sweat secretion. Eat more vegetables and fruits. 2. Apply medication: antiperspirant lotion such as aluminum chloride or utrophin solution can be used externally to reduce sweating and thus alleviate the symptoms. But it can not be cured. Fox odor does not affect physical health, but may bring greater psychological and social impact. Attention can be paid to regulating mood and relieving symptoms by the above ways. The above medications should be used under the guidance of a doctor. If the condition is serious in adulthood, Botox or surgical treatment can be chosen under the guidance of a doctor.