Tropicals & Tender Perennials: Help! Stuff on back of Hoya leaf, good or bad?, 1 by plantladylin

plantladylin wrote:
I need HELP! Please, pretty please?

(actually I do need help, but my Hoya also needs help and I think y'all could probably help it before you could help me.)

I got this H. blashernaize (?sp?) in a trade a year ago and had totally forgotten about it. :( I am such a bad plant mom at times! I found it hiding out on the deck behind some other plants, none worse for wear. It got light and apparently enough water from when I spray everything with the hose. It just got lost in the menagerie for awhile and I have no idea what this stuff is covering the back of a few of the leaves. I noticed this patch of gray "stuff" on the back of three or four leaves and I hope it's nothing bad but I have no clue. I can't remember ever seeing anything like this on any plant before. It's almost like the back of the leaves are scabbing over if that makes sense. Is it some sort of scale? Doesn't look like any scale I've seen before. Or, could it be some sort of fungus? Oh, I hope it's nothing serious and that someone can tell me what to do or if it okay to just leave it alone. It only seems to be on the reverse sides of the leaves, the tops look fine. Thanks bunches, for any ideas and suggestions.