Welcome to the Lyme page -- I am sorry to hear about your friend's illness. I agree with grdner's comment above, that the Lyme page doesn't have information on this and a better source is likely the cancer community on MedHelp.
I just went to that page and found some possibly useful post, including these parts of posts that may lead you to some other comments and posts:
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Title: "Lip Cancer?" -- posted in the MedHelp Cancer Community
Hey people, i have had a lip bitting problem for about 10 years now. I bite off the inside skin of the lip, and it used...
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Title: "Lip" -- posted in the MedHelp Dermatology Community
hi, i have a dry patch on the top of my lip. it started off about 2 months ago as a small discolored dot, then progressed...
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Title: "Some help" -- posted in the MedHelp Dermatology Community
Jul 05, 2009 by joman_17
Hi, ive had this lump, its like a miniature size of a pencil eraser on my inner lower lip, sometimes its small then it ge...
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Best wishes to your friend and to you --
I am sorry for the condition your friend finds herself in, but I have no information on your question. You might try posting it on one of the cancer communities as I'm sure the folks there would have more input. Best of luck to you both.