What is the reason for leukorrhea turning yellow like bean curd and lower back pain and abdominal pain?

Patient's question:

Detailed medical condition and consultation purpose: Gynecology
Duration and persistence of the current illness: 1 month
Current general condition: Yellow vaginal discharge, like curd, sometimes lower back pain and abdominal pain
Previous diagnosis and treatment history and effectiveness: Inserted an IUD (Mirena) in April
Auxiliary examinations:
Medical history:

Doctor's answer:

Hello: You may have candidal vulvovaginitis, which can be diagnosed through a routine vaginal discharge test. The most common symptoms of candidal vulvovaginitis are vulvar itching and a significant increase in vaginal discharge. The itching symptoms of patients can vary in intensity, occurring intermittently. The vulvar itching caused by candidal vulvovaginitis is generally more pronounced than that caused by trichomoniasis. Severe itching can make it difficult for patients to sit or lie down, causing restlessness and disturbed sleep and appetite. Patients may also experience a burning sensation in the vagina, which is particularly noticeable during urination. In more severe cases, symptoms such as frequent urination, painful urination, and dyspareunia may occur. An increased amount of vaginal discharge is another main symptom of this condition. The discharge is usually thick and may be white or yellow, or it may be thin. A typical symptom of candidal vulvovaginitis is a cottage cheese-like or creamy curd-like discharge. During gynecological examinations, depending on the severity of the condition, the labia minora and vaginal mucosa may show varying degrees of congestion and edema of the labia minora. The vagina may contain a large amount of viscous discharge, or the vaginal mucosa may be covered with a white membrane. If the white membrane is removed, the exposed mucosa may appear red, swollen, eroded, or have superficial ulcers.
If diagnosed with candidal vulvovaginitis, a 2%–4% soda solution can be used to rinse the vulva and vagina daily or for sitz baths, with a 10-day course to alter the pH and create conditions unfavorable for the survival of the fungus. Then, nystatin can be used, such as in powder, tablet, suppository, or ointment form, inserted into the vagina or applied locally, with a dose of 10–20 million units per time, once daily, for a 10–14-day course. The vulva can also be treated with 3% miconazole ointment for better results. Since this condition is stubborn and prone to recurrence, local treatment is generally preferred. Oral nystatin tablets can also be taken, with a dose of 5–10 million units three times daily, for a 7–10-day course, followed by a follow-up examination to ensure three negative results.