Fuzzless,

I have to chime in here just for a second. Lichen planus, in all forms, tends to be really poorly defined in all I have learned and read.
I send all of my patients with any form of Lichen planus, whether new, or pre-existing that I come into contact with for biopsies.
In my experience, and some literature supports this, it can be a premalignant condition. Long tearm trauma to tissue whether it is mechanical trauma, chemical trauma, or disease induced trauma can predispose a person to cancer. When healing has to occur, which is ongoing with lichen planus, all it takes is one cell to do the wrong thing.

Cheers,

Mike