I have a dark spot on my mouth what can it be?

I have a dark spot in my mouth where I usually bite my cheek, I went to the dentist and the doctor took that dark part and sent it to the biopsy, but I'm very worried, what can it be? I do not feel any symptoms, but this has bothered me a lot.
Expert answer:

For now it's just a dark stain. Wait for the result of the biopsy to know what it is, that's what you did the exam for.

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