Black markings on cactus

Trouble shoot problems you are having with your cactus.
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mickey48
Posts: 26
Joined: Fri Apr 01, 2016 5:15 pm
Location: Philippines

Black markings on cactus

Post by mickey48 »

I have a cactus that's like a Pilosocereus pachycladus.
I removed some kind of pest that looked like scale.
It left a mark and in the next day, the exact spot where I removed the pests turned black. The mark hasn't expanded yet or got deeper even after a day(or did it?).
Will my cactus be okay? Or do I have to cut out those small black marks?

Thanks!
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