Answer: I can't tell from your description whether the white dots are a fungus or insects. Indoor plants can become diseased if they are overcrowded and the air circulation is poor, and if they are over watered. Common insects on houseplants include mealybugs and scales, and sometimes whiteflies. Mealybugs and scales usually congregate on stems and in the crotches of branches; whiteflies will fly away when you touch the leaf. Once you figure out whether the problem is disease or insects, you can take control measures. Good luck with your plants!
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