if not used to sun, can definitely be a reaction to too much light... it'll lose pigment and turn pale.. spots then the whole damn leaf, lol.
ease them into it... maybe shaded at first and slowly increase intensity of light, if you want them outside. I'd sugget sticking to one or the other... bringing an indoor plant outside is just an easy way to bring back bugs and infections to your indoor area. fine to start there, then move out, but bad idea going other direction if you can avoid it.
Typically the wilt a bit before the pale spots form... easy to see them in stress when too much light... wilted with plenty of water.
easy to rule out mold.. is is powdery? looks like a lack of pigment in pictures though.