Plant disease

Plant disease

I notices some problems with the foliage on some of my begonias that I took outside. Some of the leaves are getting pea-sized, whitish, flat spots on the leaves. When the white dissapears, it evidently leaves a brown spot on the leaf. The white area looks slightly fuzzy, is it some kind of fungus? What do I do about it? So far it appears to only spread to them, not other plants.
MOLD UPDATE!

MOLD UPDATE!

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Lots of Pictures, My first Garden. :D

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