Q.Why Does My Indoor Monstera Plant Have Discoloration On One Leaf?
The lighter green discoloration appears in a semicircular shape on one leaf.

GKH_Susan
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on March 21, 2022
It looks like insect damage from spider mites or aphids. Look for evidence of tiny webs for spider mite damage. Aphids usually hang out underneath the leaves.
Neem oil should get rid of them.
https://www.gardeningknowhow.com/plant-problems/pests/insects/spider-mite-treatment.htm
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