A three-year-old girl has white discharge at the urethral opening, what is the condition?

Patient's question:

Patient Age: Three years old
Detailed Condition and Purpose of Consultation: A three-year-old girl has white discharge from the urethral opening, what is the condition?
Duration of Current Illness: Approximately one year
Current General Condition: White discharge at the urethral opening
Medical History: None
Previous Diagnoses, Treatments, and Outcomes: Recent blood tests for chlamydia and mycoplasma were both negative

Doctor's answer:

Hello friend, don't worry. In this case, it is recommended that you pay attention to hygiene and cleaning. Also, be mindful not to get angry, and that should be fine.