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Is there anyway you could take a picture and attach it to this discussion in order to give you a better answer?
Well usually what we call these types of lesions are, traumatic fibromas. Essentially its an area of tissue in the lips or cheeks that are same color as surrounding tissue, but they form a little nodule from basically reoccurring trauma (biting it accidently is an example). Many people get these, my husband had one for a few months that was the size of a pea or so in his lip and drove him a little crazy accidently biting it. These can change size, but typically go away on there own. Sometimes they persist and for the annoyance factor people have them removed. But as it sounds this is likely what you are experiencing and holds no concern. If you noticed the lesion start to become red or white, or significantly grow in size than you'd want to have a dental examination of this area of course.
Correct these lesions are smoothish and rubbery. They typically appear in because of a trauma similar to biting lip, but that doesn't mean that it popped up from doing that or even remember doing it. Most people have no recollection, the fibroma just started to appear. I understand that concern. Again if you had a picture (even though you state its nothing to show) that may help.
Are you or your husband a smoker?
I understand that and thanks for letting me know. I was asking more because some individuals get lesions like this when they have just quit smoking. Now that you submitted the picture I do not believe that this is fibroma, too large and flat. It may be a stomatitis. This is basically an inflammation that could be caused by a variety of things. It could be as innocent as you had something with cinnamon, changed toothpaste, virtually a ton of things. Although that doesn't help narrow it down, I'm not concerned after viewing the type of lesion that it is. I would recommend at this point that if the lesion doesn't resolve on you or your husband in the next 2-3 weeks you should have it seen by dentist so it can be measured and tracked for size changes.
If there isn't anything else you want to ask, if you would please provide a rating so I can close our conversation, thanks.