Plumeria

Question

I am trying my hand to grow a plumeria. One of the leaves is going lighter in colour and now has black spots on it. What is going on?

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Answer 1

If only one leaf is affected this way, and if its a lower leaf, then it may just be senescence, natural loss of an older leaf. The leaf discoloration and distortion is not characteristic of common pest or disease issues of plumeria that I know of, so it is more likely an environmental issue like watering too much or too little.
What kind of container is it in? Does it have good drainage and being watered appropriately? Even being too close to a window or door could give it an exposure to cold air that could cause this.

https://www.gardeningknowhow.com/ornamental/flowers/plumeria/growing-plumeria.htm