Hi Kathleen, uploading a picture would help... From your description it sounds like mealy bugs. Mealybugs are typically found on the underside of the leaf.
Here is some more information about them :
Mealybugs are common insect pests that tend to live together in clusters in protected parts of plants, such as leaf axils, leaf sheaths, between twining stems and under loose bark. They suck sap from plants and then excrete the excess sugars as a substance called honeydew. This lands on the leaves and stems were it is often colonised by sooty moulds, giving the surfaces a blackened appearance. (https://www.rhs.org.uk/advice/profile...)
If they are in fact mealybug, you can kill them with soapy water (2 tbs of any liquid soap and 1 liter of water) and mechanically remove them, by scraping them off.
I hope this helps, please keep me informed.
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