The little girl knocked the lower body vaginal opening a little red, can be relieved by daily care and local topical medication. 1. Daily care: if a little girl’s vaginal opening is a bit red after knocking her lower body, and if there is no local damage, there is no need for special medication. It is recommended to pay attention to washing the local area with lukewarm water to keep it clean and dry, and to wear loose underwear to reduce friction on the local area, and the area will be back to normal by itself in 1~2 days. 2. Topical medication: If the vaginal opening is red and broken after knocking the lower body, you can use iodine povidone to wipe the broken area, apply erythromycin ointment to prevent infection, avoid local friction and scratching, so as not to cause local infection. If the symptoms of redness, swelling and pain are serious, you can also take oral amoxicillin under the guidance of the doctor to reduce inflammation.