Will the Buccal Fat Removal Scar Inside Mouth Go Away?

Intra-oral incisions from buccal fat removal usually heals to the point the scar is wither minimally visible or invisible. Healing process takes several weeks to months. By 3 months post surgery, patients could expect a healing of about 80-90%. 
At 1 week post surgery, buccal fat removal incisions are still healing, therefore they may look very conspicuous to the patient. 

Dear Bumbumbaby,

It is normal to feel the "lumpiness" you have mentioned in your description. You will need to give the scars some time to heal without you trying to feel it constantly with your tongue.

Eventually the scar will become flat and less distinguishable. Patience is required while healing takes its natural course.

Thank you for sharing your concern.

Dr. Sajjadian

Any new scar inside the mouth will feel firm, sore, and raised, and if you look hard enough it will also be visible at first. Over time, however, just like wisdom teeth removal, cleft palate repair, or any kind of intraoral surgery, these scars will soften, fade, and become virtually undetectable, even to close inspection. But, this will take several months, so be patient and try not to "fuss with" the scar with your tongue!