A 4.5-year-old girl has red external genitalia, what should be done?

Patient's question:

Patient Age: 4 and a half years old
Condition Description: A 4 and a half-year-old girl with red external genitalia, seemingly with some discharge (I can't describe the specific color), and yellow stains on her underwear after it dries. She often complains of pain when urinating.
Previous Treatment and Effect: She has been frequently washed with clean water, but the effect is not significant.
Help Needed: Hope the symptoms of red external genitalia disappear, the discharge also disappears, and the pain when urinating is resolved. Thank you.

Doctor's answer:

Considering there may be a urinary tract infection, urinary tract infections are often caused by bacterial or viral infections and commonly manifest as pain, burning, itching, or a foul odor in urine. It could be due to poor hygiene, irregular diet with excessive consumption of spicy foods, or a weakened immune system, leading to vaginal flora imbalance and resulting in vaginal inflammation, which may be accompanied by urinary tract infections.
It is recommended to take Kaixinwan Oral Liquid orally for treatment. The diet should focus on light and easily digestible foods, and avoid spicy, fish, shrimp, and other irritating foods.