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I had two tires split at the valve stem. One actually started to leak so badly that I had to change the tire.
My max PSI is rated at 44PSI on the sidewall, and I was running 55 PSI, but on the day of the tire failure, I filled them to around 55 or so ........... and found out later how inaccurate that tire guages can be. I was actually at around 65- 70 + PSI.
( So it's a good idea to check the pressure with more than one guage. )
In my particular case, both tires failed at the valve stem. In your case, it appears to be the tire itself. I would deflate to normal levels and have a tire shop check the tire.
Better to do that then to put you life, as well as others in danger for a few pennies worth of gas.
I have seen similar marks on tires before that were at normal PSI levels. It may be common actually , and something that you only notice in certain lighting conditions.
I actually had this sort of mark on the tires that I used before my current set.
It always bothered me.
I would get a second opinion from an expert.
Stay safe !
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