Three-year-old children turn over the foreskin glans red may be related to the foreskin glans inflammation, allergies, mosquito bites and other reasons. 1. Foreskin glans: when the foreskin and glans are attacked by bacteria and other pathogens can cause an inflammatory reaction, there can be redness of the glans after turning over the foreskin. 2. Allergy: If the child is allergic to the components of the underwear or diapers, the redness of the glans after opening the foreskin can occur. 3. Mosquito bites: Mosquito bites can lead to redness and swelling of the affected area, resulting in redness of the glans after opening the foreskin. In addition, there are many other reasons can lead to three-year-old children turn the foreskin glans red, parents are advised to take their children to the hospital in a timely manner to clarify the cause of the disease, standardized treatment under the guidance of the doctor, so as not to delay the condition.