Symptoms include: bumps, rust fungus like patches, buds and fruits at autumn and winter, deformed/elongated leaves, spreads by spores. It can be more subtle. Just a few bumps on a leaf. Watch your plants closely.
It appears to be widespread on Aeoniums in cultivation, and I have noticed it on Aeonium lily pad.
Photos from Plant parasites of Europe:
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This is highly contagious, but there is a possibility that fungicide may work.