I just bought both of these orchids within the last month. The biggest one (first photo, bottom of two leaves) seems like a healthy beautiful plant, and honestly I can't remember if these spots were there when I purchased or not. The second plant was a rescue from the local hardware store, it was severely dehydrated but in just a week has really started to perk up. I am 95% sure the spot on the leaf (2nd pic, top of leaf) is new, but since it was in such bad shape and the leaves are just starting to plump back up, I am not so sure.
Is some sort of leaf disease? What should I do to treat?
I just noticed the other day a strange dark hollow spot on the big plant's leaf stalk, 3rd pic. Is this something to worry about as well?