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Do you happen to have a picture of the area you are describing? This sounds like what is called linea alba and is caused from cheek biting. I have attached a picture.
Basically all you can do is if it gets severe have your dentist fabricate a mouth guard for wear at night. During the day try to consciously not bite your cheek. If you have a malocclusion (bite that is off) braces may help correct the situation also. Please let me know if there is anything else I can answer for you. If you wouldn't mind also taking a moment to rate my service I would appreciate it :)
Posterior cross bites can predispose you to the situation you describe. I've attached a cross bite picture to help you understand if you have this. Normally the top jaw teeth should be wider (outside) of the bottom teeth.
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Just let me know and as mentioned about i'd appreciate if you could leave a rating :).
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