The most common cause of black spots on a majesty palm is sitting in too much light. Direct sunshine can burn the leaves. Try moving your plant into bright but indirect sunlight and the problem should diminish. There's nothing you can do to help the affected leaves recover, though, so when they begin to age you can prune them off the plant. Majesty palms like humidity. You can mist your plant on a daily basis to help increase humdity. Best wishes with your majesty palm.
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