Aphids can be such pests! While it seems like every succulent grower I know has had to deal with them at one point or another, getting rid of them is not too difficult.
If you need a bit of a stronger approach, you can also spray your plants with insecticidal soap.
To prevent aphids from being drawn to your plant in the future, be sure your succulents are in well-draining soil, and that you are letting your soil dry out completely between watering. It’s also important not to reuse your soil after repotting. This will help prevent eggs from any pest spreading into your new pot.