Given that information, I'd say almost certainly it's just physical damage from cold, sun or wind. Temps in the 40s will set tomatoes back; it's best to wait to plant until lows are consistently in the 50s. Also, the hardening-off process can take a week or more before planting (if the garden center didn't already do it). Still, tomatoes are pretty resilient and they should recover quickly. Good luck!
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