Tumor in upper gums. Help!

[Krystle]

I've come to find out that my mom has a tumor in her upper gums. When she had her wisdom teeth pulled she developed this bump. It's not painful and looks like if one side of her gums are largely Inflamed. She's actually had this lump for about 20 years now and she never thought anything of it. Over the years it has grown slightly bigger. She is finally seeing the oral surgeon and waiting on test results. Just wondering of anyone has heard of this or knows what it can be. Oral surgeon says it could be bone build up? Anyone waiting for test results knows that it can the longest and most stressful time :/ please help