Aloha Kate.. I live on Maui, so we are both experiencing the same wintery weather over the last several days.. I wish I could offer an explanation to,you about the leaf bumps but I haven't seen them before.. I can tell you that the colder nights, high winds and lots of rain we have experienced recently have caused many of my plants' leaves to turn yellow and drop off.. This is a typical reaction, in my experience, to a change from our usual summer-like weather.. I would not worry because the plants always recover with new leaves and branch growth. Perhaps someone else can explain the leaf bumps for you.

Kate, I cannot comment on the bumps on the underside of the Yellowing leaves. Does not look like an insect damage. Could be a blister and that is the sap underneath this bump.

Generally if the leaves start to yellow at the bottom of the branches, I do not get too concerned. When it is the uppermost leaves, then I start thinking roots.

With the cooler temperatures that you are experiencing out of the norm, you could very easily see signs/changes with your plants.

Wish I had more information for you. I would for safety sake take all leaves with this blistering and put into garbage.

Rick

I'm feeling relieved after reading your posts. I've removed the blistered/yellowing leaves. The drop in average temps by at least 10 degrees was pretty sudden. I was suspecting that was the main issue, but was not sure. Keeping an eye on any additional bumps. Fingers crossed. Thank you paradiseprincess51 and Rick.

spray soap water,i can see tons of damaging insects,i have the same here they make the leaves yellow and fall