Answer: Hibiscus mutabilis is the Confederate Rose and it can be attacked by thrips, aphids and whiteflies. All of these sucking insects can leave traces of toxin when they pierce the leaves to feed so I suspect, even though you're not seeing any pests, that they have been there and done their damage. I'd pinch off the affected leaves and watch the plant for signs of additional infestation. If so, you might be able to identify the pest and take control measures. Best wishes with your Confederate Rose!
Q&A Library Searching Tips