Night Blooming Cereus black spots

Knoxville, TN

My night blooming Cereus has raised black spots on some of the leaves. Can someone identify the spots. The spots don't really seem attached tight. Is this something I should be concerned about?

Thumbnail by Connie7679
Castro Valley, CA

Looks like caterpillar poop. Do some leaves have bites taken out of them? Look under and on top of leaves. Look at night with a flashlight too.

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