The anatomical and physiological characteristics of infants and young children, such as the thin skin and mucous membrane of the vulva, the undeveloped labia majora and the proximity of the vaginal opening to the anus, as well as bad habits such as wearing diapers for a long time, playing on the floor in open trousers, touching the vulva with dirty hands and wiping the anus from back to front after defecating, lead to inflammation of the vulva easily caused by bacterial infection and redness and swelling of the vulva.