White mole in my thumb

I have a white mole on my left thump which is larger than most black moles. I have a hobby of biting my finger nails, and I am having a small white scar like thing on my lips, when I consilted a doctor he told me that it is beacause of I bite lips. Is there any thing to worry.
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Dr. Manoj Agarwala
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​Hi  Please see a dermatologist for the needful.​ If your dermatologist feels, a skin biopsy may help. Habitual lip licking is bad.
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