Your plant could be infested with whiteflies (if they fly away when you touch the leaf) or mealybugs (if they don’t move). Or it could be aphids. If the insects appear to be mealybugs—white, cottony-looking creatures that congregate in the area where the leaf meets the stem—try dabbing them with rubbing alcohol. Keep a very close eye on your other houseplants, as all these pests spread easily. At the first sign of the insects, begin spraying.