The brown color on the underwear of a child ten years old may be due to menstruation, inflammation of the reproductive system or urinary system and other reasons. 1. This may be a pre-menstrual manifestation, suggesting that the child is going to menstruate when he enters puberty. At present, people’s living standards continue to improve, some children around the age of 10 years old may appear the development of secondary sexual characteristics, it is recommended that the patient to observe for another month or two, if the situation again may be the first menstruation. 2. may also be caused by inflammation, such as vulvitis, vaginitis, urethritis, cystitis, etc., is due to the child does not pay attention to the vulvar parts of the hygiene caused by the parents are advised to take the child to the hospital to do secretion or urine examination, usually pay attention to perineal hygiene, the child to drink a lot of water, and change the underpants diligently. If the child is ten years old, there is brown on the underpants, it is recommended to consult a doctor in a timely manner, with the help of a doctor to clarify the cause of the disease, and targeted treatment or treatment.