Will using Houttuynia cordata cause any side effects for cervical erosion?

Patient's question:

Is it effective for treating cervical erosion to wash the external genitalia with water boiled from dried fishy grass? I always think it shouldn't work (the cervix is inside, how can washing the outside have any effect)? But many people where I live say it works well. Is it really effective? Will it cause any side effects?

Doctor's answer:

Hello: The specific effect is uncertain, it should have no special therapeutic effect.

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