A 4-year-old girl’s red, swollen, and itchy vulva may be caused by vulvitis, which can be treated with potassium permanganate solution sitz baths and oral antibiotics.

A baby’s lower body redness might indicate vulvitis, which can be treated with potassium permanganate sitz baths or red core itching solution, along with maintaining perineal hygiene. Bloody stools may suggest intestinal damp-heat, and treatment should focus on clearing heat and dampness, cooling blood and stopping bleeding. Consider taking Diyu Powder with modifications, and pay attention to a light diet.