Answer: Umbrella trees produce insignificant green flowers that later turn brown. Perhaps this is what you're seeing. As long as the plant appears healthy, I suspect it's a natural process with your plant. Aphids, because they have piercing, sucking mouthparts, can produce lumps and bumps on foliage, but it's generally accompanied by yellowing of the leaf. Just continue to give your plant general care and watch the plant (and bumps) carefully to see if there are any changes in growth or color.
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