The information provided here is not a replacement for a doctor. You shouldn't use it for the purpose of self-diagnosing or self-medicating but rather so you can have a more informed discussion with a professional TCM practitioner.
In Chinese Medicine verruca plana can be treated by one herbs that we have on record. Here is the list below.
Because it is a herb specifically indicated to treat verruca plana as can be seen on Job's Tears's page.
Its main actions are: Regulates water and encourages urination. Tonic to the Spleen and stops diarrhea caused by Spleen Deficiency. Reduces inflammation and eliminates pus. Dispels Wind-Damp Bi Pain. Expels Damp-Heat.