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If you've got marks on the sidewall because the tire was in contact with the road surface, then you have a tire that is structurally unsound. What you can not see is the inside where the inside of the tire was rubbing on itself and was in the process of destroying itself.
The question now becomes how much risk are you willing to take. The tire is going to fail and the only question is how long it will take to do so. The inflation pressure really isn't an issue. The durability of the tire is and that part of the tire where the durability has been compromised is not affected by inflation pressure.
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