From my research, the following are less invasive and work anywhere from 60 - 80%, so you might want to consider one of these with your doctor before going to excision. Also, if you're doing excision, usually it's combined with intralesional corticosteroids or radiotherapy. Anyway, best is to be in the hands of a good doc who has done this a million times sort of thing.

• Cryotherapy
• Cryotherapy + Intralesional Corticosteroids
• Intralesional corticosteroids + intralesional 5-FU
• Intralesional chemotherapy
• Intralesional corticosteroids