Okay - not to scare you but YES! I would ask to see the ENT ASAP - it can move and travel to different locations. Within the mouth, though tongue generally travels around the tongue - possibly to base of tongue and ocassionally but rarely to tonsils...Maybe it's a lot like real estate... location location location. If that makes sense. From reading other people here I've noted that cheek can move to gum and back and forth. A lump - could be anything, but mine presented as a lump under the surface. I thought it was scar tissue as I'd had thickened skin removed from the same area 10 years before, but NO it was a tumor, and it grew under the surface, and I had NO visual lesions - just pain.
Also if it was well differentiated the first time, there is no guarantee of it being the same the second time around. In fact as it moves it sometimes becomes more aggressive. Call and ask to be put in if there are cancellations.
hugs and hang in there. At worst if it is a recurrence, then you have caught it early at best it's nothing and you've put your mind at ease.