I have the same thing on one of my Michelin Defender LTX LRE truck tires. I had my America’s a Tire dealer take a look at it and he said it was normal and no problem.
2018 JayFlight SLX 212QBW
1999 Ford F-250 Super Duty Lariat SC, 7.3L PSD, 3.73
Transfer Flow 50 gal aux; Andersen WDH
😁 "If a man says he’ll fix something, he will. There’s no need to remind him every 6 months.