Spots on my basil leaves?

Question

I found some spots on some of my basil plant leaves. The spots are either white or very light yellow. They are very small, like the same circumferance of a small pin.
What are they? What's going on?
The plant is in a pot. I was growing in my kitchen but ants came for it so I moved it to my picnic table outside.

Answer 1

ants keep aphids as pets

Answer 2

Do not watering in leafs those spot are calcium cause of water and it dry the leaf.