I took a close look at one of my plants, and saw all these tiny yellow bugs.
They don't seem to be hurting the plant, but I thought I'd ask to make sure.
If it helps, this is in the San Francisco Bay Area.
They look like aphids to me. Spraying the plant with neem oil or an insecticidal soap should help clear them up. You could also wipe down the plant before spraying it so you get rid of the bulk of the bugs quickly.