Eli5 bubble on my tire

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I just got a new tire put on my car a few weeks ago. Earlier this week I noticed the tire had a bubble on it. Ironic because the whole reason I got a new tire was because the previous tire had a bubble. Anyway, took it back to where I got the tire and they replaced it but they had determined I hit something (i.e. a pothole). I had hit a pothole, a small one at a construction site near my home. My question is, how does a brand new tire bubble after hitting a small pothole?

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