What are these lines in my pool plaster?

I finished the pool in July and check the water every week, adjusting it as needed. But these lines started showing up, and I thought it might be etching, but I can’t find any pictures that look like this. Thanks for any help!

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Check if it’s cracking—it’s totally normal.

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Was it really hot when they put the plaster on?

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@AquaAdventurer It was indeed super hot.

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@Terryanne There you have your explanation then.

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Search for “pool plaster crazing” on Google Images and check if it looks like your problem.

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@BreaststrokeBuff I couldn’t find any clear information.

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I’ve had them since last summer too. I don’t know why, but I’m interested.

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@CurrentCrazeI asked my pool company about it and will update you soon. It seems like crazing, but I haven’t seen anything exactly like this before.