Canker sores are shallow, painful sores in your mouth. They are usually red or may sometimes have a white coating over them. You might get them on the inside of your lips, the insides of your cheeks or under your tongue. Canker sores are different from fever blisters, which usually are on the outside of your lips or the corners of your mouth.
Anyone can get canker sores, but people in their teens and 20s get them more often. Canker sores may run in families, but they aren't contagious. Doctors don't know what causes canker sores, but stress may be a factor.
I would suspect that the potato chips are cutting into your skin and causes sores. Based on the description above you should be able to look inside you mouth to see if these are cancker sores or not.
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