In my opinion, it is too early to call it a cancer
Don't panic, and simply make an appointment with your dentist and let them have a look at it. It may be something far less serious than you think.
It's hard to tell from the picture, so I recommend you to visit a dentist.
As mentioned by LisaP80, its too early to call it cancer and this needs a better examination.
Chances are that this resulted from cheek bite,due to the erupting molar.
Don't panic. You local dentist can get you re-assured.
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