Looks more like regular spider web to me. Spider mites are so tiny that the only way to really tell for sure is when they start sucking your leaves tell they turn dry or when you brush the under leaves with a wet white paper towel and you see the little black spots or by using a magnifying. Lense.
For the first time this year I've seen a few of my plumerias with leaf distortions similar to yours or maybe even worse. The only thing I can think of is I did put a generous amount of slow release fertilizers when I reported then but With a lot of rain. I probably have overfertilized them.
Some of the imperfections on your leaves are most likely regular wear and tear on the life of your plunerias.
