Hi there and welcome. It sounds a lot like a leukoplakia - what you described - I had one on my tongue 10 years ago - it's like a thickened patch of skin - do have it biopsied - they may remove it all at the time of biopsy. Mine was negative for cancer and came back thickened skin - however - where it was is the exact same spot where I had the tumor on my tongue 6 years later- sooooo - here is advice I wish someone had given me - even if they do remove it - and it comes back negative for cancer - keep an eye on that area! Check it once a month - visually and palpate it . ( touch it to see if the area feels normal ) experts can't agree but some of them do say leukoplakia can be a precursor to cancer. Good luck and fingers crossed for you that it's good news. And the advice Christine and Anne Marie gave you is great see someone like an oral surgeon or ENT - and know what a thorough exam is.