My mouth is turning from brown to pink, what is happening?

Hi my bottom lip is turning pink gradually and my original color is brown. Few weeks back my entire inside mouth becomes black with lot of pain so I used Canker-X for treatment. I am bit relieved but my bottom lip is turning to pink gradually it looks so unnatural. Please suggest me what happened to my mouth and how to reduce this kind of discoloration inside mouth turning to black.

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