I would say it looks fine. I would have to see it in person, but it looks like just the surface rubber was kind of torn off. Kind of like if you scrape your arm on an edged surface, you don't really cut the skin, but tear it.
The tire shop, if reputable, will tell you what's up. If they're not reputable, they'll just replace the tire.
Either way, you're not losing that much there. It will definitely suck to replace the two rears though. If you're on the stock Potenzas, they wear too much in 4000 miles to warrant just the replacement of a single tire.
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-Phil
"Since one of my brake light bulbs just went out, the forum told me that my piston rings are about to blow."
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