I don't remember any lip cancer patients here. You really fit a profile though, life guards, forestry workers, farmers, anyone that has spent a large portion of their life in the sun without lip protection. I have met one person that was a tobacco etiology who held a cigarette in their lips in exactly the same place for years. It is possible that the hard spot is scar tissue related to the previous procedure, and is just fibrotic tissue. Some tongue cancers on the periphery of the mobile tongue begin as an induration that a screener can feel with the fingers during the exam. Always better safe than sorry so having it checked out makes good sense. here is a link to finding the best of the best.

http://health.usnews.com/best-hospitals/rankings/cancer