Hi! I don't log in here much but saw this and thought I'd reply. I am sort of dealing with the same thing with the hard lump.... my story though starts with a tooth that was chipped when I was a kid, it was root canalled and crowned, eventually had an apicoectomy, then it was extracted. I had an implant put in that didn't take, and then a second implant that did, but I did notice after extraction this hard lump that formed in the gum below the tooth. The oral surgeon insisted it was just "extra bone" and nothing to worry about. I did see another oral surgeon for a second opinion and he acknowledged that the bump was at not normal at least and referred me for a cat scan to see if the bump was osteomyelitis. In my case the cat scan came back inconclusive because the bump was what they called "Bone sclerosis" but there was no inflammation. So basically was told unless I am in pain to just leave it be.... I do get pain every now and then and I have anxiety over this that it is a chronic infection just sitting in my mouth....plus all of the thousands of dollars I wasted in the implant process.... I guess bottom line here is just make sure your dentist or surgeon doesn't brush it off and push for a cat scan to see whats going on.