careful_eugine

Please could someone help me identify a problem with one of my bonsai. Recently some of the leaves have begun curling and going slightly discoloured. At first I thought I had maybe left it in too much light, but I have now noticed lots of spots on the truck. They look a little like small blisters. I can't see any insects/bugs. If any other info would be helpful let me know + thanks in advance for any help!

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