Concerned about suspicious looking mole - skin cancer? (photo)

I have a suspicious-looking mole on my underarm area. I have made an appointment with a derm for a skin exam, but wanted an opinion while I wait. I am able to mark this moles appearance at least 3 years back (may be longer but no photos). Since then, it has not changed significantly, but may have become raised and lighter in color. I am worried since it seems slightly asymmetrical, and has some pink color variation, although to the naked eye it seems only brown. It measure 5mm.

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