>>1495747I had a simmilar problem, those blisters would make a holes (pic), and later brown on the edges. I've left some of the leaves on and it didn't seem to bother the plant...
I'm not sure it's overwatering, I usually let them dry out and droop before watering, but I've done tests with lowered and hightened waterings and it doesn't seem to make a difference...
And it's also weird it only happened on Verde variety, not a single dot on purples...
Tldr, don't worry, don't overwater anyway...