I recently got 2 small cala lily plants (they were on the discount rack at the grocery store). I repotted them about 3 weeks ago, but one seems to have a kind of white fuzz on it. It's on the older leaves but also on new leaves when they emerge. It looks like little cotton balls, and when I pick it off or wipe it away it doesn't come back.

I'm thinking I overwatered when I repotted, or maybe the bulb was rotted before I even got the plant.