Black spots on my cactus
My Cactus started showing some small back dots near its top a week ago. I cut one small spot off and most of the removed section turned black the rest turned white. I’ve had him under a light for the past week and the spots haven’t changed at all. I also recently repotted him into a special cactus blend soil. The spots look like they are just near the surface. They are very small and not soft. Is this mold or just the result of moving somewhere with less sun than he is used to?
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