Looks like damage from sucking insects to me. Treating any infestation would help. Sometimes overwatering can cause leaf edema which results in abnormal looking foliage as well so careful attention to watering as well. Fertilizer won't help with if these problems but maintaining good nutrient intake with a good balanced fertilizer with micronutrients is always good for plants. Look carefully at the undersides of the leaves, perhaps post a closeup of the undersides.
KarenO
KarenO
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