This is a mealybug (the most annoying houseplant pest). 

At some point you will encounter mealybugs on your houseplants. I used to believe it wasn't true, but in my experience anyways...they will rear their mealy little bug heads all over some or all of your houseplants at some point.
Don't let the little mealybugs freak you out too much though. You can treat them by manually removing them and spraying Isopropyl alcohol on your plants. In some cases you might even want to change the soil your houseplant is living in. Keep calm and houseplant on 🐛
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