Hoya experts, I need your help. :) My hoya has been outside getting noon sun only. I have two different kinds of brown spots. First are the round brown spots in one section. The other involves brown spotting around the edges of the leaves down one stem only. Bugs? Fungus? Too much sun? Should I cut them off? I did the shake test to look for spider mites, found none. Inspected it for mealy bugs and didn't find any of those either. I sprayed it down with Raid since I did see some very faint stringy webs on it.