What's growing on this begonia's soil?
I have a begonia in a ceramic pot without a drain hole in the bottom. The plant itself is very happy and growing well, the problem is the surface of the soil. I noticed there's white, moldy-looking crud on it. Up close, it almost looks like there are tiny eggs or something in it, but I can't really tell. Here's a picture:
Should I just scrape it off? What caused it?