How can there still be black blood more than a month after cervical erosion surgery?

Patient's question:

2013.10. Postoperative

Doctor's answer:

Hello, it may be due to the reasons that pelvic inflammatory disease and cervical inflammation were not cured. Pelvic inflammatory disease can be treated with amoxicillin/clavulanate and metronidazole injections. Cervical erosion can be treated with Lipp or Xiaomi Shuan, among other medications.