An oddity

CC: Lump on tongue

My boyfriend does not have insurance but recently went to both his PCP, and an ENT specialist about a small lump he felt on his tongue and was told they did not know what it was. The ENT however prescribed amoxicillin 500mg tid for 10 days in case it was a bacterial infection, but also suggested it might be cancerous.

I was the first to see the lump and at first it looked like a taste bud have been pulled out of place. The area has no pain and my boyfriend does not experience any foul taste in his mouth. There doesn't seem to be a bad smell but he does have an aroma of garlic. Which he does not really eat. He did not seem to have any fevers. He did salt water rinses before going to the PCP but it did not seem to help. The lump continued to grow and it is now about 3 weeks later. The PCP states that the lump is the size of a small marble. He has just started his course of treatment.

I have a few questions.

The first being: "What can he expect if indeed it is bacterial?"

and the second "What is the likelihood that this lump is cancerous?"

and the third being "What are other possibilities of what this lump could be?"