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podowart is the right solution you are using,but don't use it daily .Strictly speaking it should be applied by the dermatologist
himself.It is used alternate days or once in a week only on the affected area.
Other methods are use of imiquimode lotion ,co2 laser
,electro cuatry etc.
At times you might require multiple sessions for complete removal.
Kindly consult a competent dermatologist for best results.