Rust Brown Stains on leafs

Drizzt-Do

I´ve been taking care of Bonsai since a year now, and in general they´re doing Fine.
There´s one bonsai i bought cheap, of whom i don´t have a clue if it´s an Outdoor or Indoor Bonsai.
I decided top put him inside, because of Frost. Then suddenly he started producing loads of small green knobs. I thought then taht it must be an outdoor, because he might have got the feeling that the springtime was starting. So i put him outside again. After a few days he started to get those weird kind of Rust brown stains on a few leaves, they´re almost square ( the staines). Now more and more leaves start to get this problem, and the small leaves are curling in, and drying out.
Please help me if possible, i just cant tell you what tree type it is.

Thanks

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