What are the reasons why gynecological diseases cannot be cured?

Patient's question:

Vaginal itching, excessive discharge, odor. Test results: ... Previous treatment history and effectiveness: Some hospitals diagnosed it as trichomoniasis, but the treatment was not effective. Other hospitals diagnosed it as candidiasis, and the treatment was only moderately effective. How can you help for a recurrence: Doctor's advice

Doctor's answer:

You have symptoms of vulvar itching and abnormal vaginal discharge. After some careful examinations, it is sometimes found to be trichomoniasis and sometimes candidiasis. This condition is not uncommon.
Suggestions:
Because medication for trichomoniasis can also suppress the normal vaginal flora, it can easily lead to recurrent candidal vaginitis. Sometimes, even after candidal vaginitis is cured, the trichomoniasis has not been fully treated, and the condition recurs. This is also encountered in clinical diagnosis.
It is recommended to undergo regular treatment, and after treatment, follow-up tests should be performed to determine the next course of medication.