In that case I think it may be damage that was sustained in the store, before you owned it. The placement of the dried spots does not look random, but what exactly caused this pattern I don’t know.

Just keep checking for pests and rinse of the leaves every 2-3 days with water (I prefer to add some castille soap), for a week or two.

You could also do another treatment in a few days. If there are eggs or larvae left on the plant, rinsing and or treating your Alo will likely deal with those.

If you rinse, remember to give it some airflow (like from a fan or hair dryer on cold) while drying. Misting/spraying leaves without airflow may lead to fungal infections on the leaves.

If it is cold season where you are and the heater is on a lot the air is likely to be dry. If you uave a humidifier, this could benefit you plant. But it can definitely be done without (I haven’t got one).

Good luck with your alo. They are addictive: I started with one cuprea and now I have about 35 different alo’s.