I've had this cactus for about 7 months now, and little smooth but hard, shell-like, scab-like spots appeared all over the plant, on smooth surfaces and in some of its crevices. I thought it was a scale insect, and from my research tried a variety of fixes - I used a q-tip with rubbing alcohol on the spots, then I used an anti-fungal spray for indoor plants, and then I went around and manually picked each piece off. Now all of those spots I picked off are turning into scars, but I've also noticed more of those spots appearing. I'm attaching pictures of the spots and what they look like after I take them off the plant. Previous spots were hard on the outside, and many of them had a brown, soft, dagger-type piece that came out of the plant. I didn't see that so much in this latest round. My question is... is there any way I can save my cactus? And are you able to identify what these spots are and how I could stop them from continuing to take over? Thank you!!