New leaves appear, plants droop if ignored, and the leaves might even change colour.
35+ Sticky Dots On Plant Leaves. Petunia leaves are slightly sticky and may hold plant seeds that drop onto them. If you look closely, there will be a pair of staggered glands on the leaf stems;
Indoor Schefflera Plant Leaves Are Sticky Ask An Expert from ask.extension.org
The polka dot plant sports spots of many different colors on the leaves like white, yellow, green, and pink depending on the variety of the plant. Place sticky pads near plants to trap whiteflies before they can land. Also, avoid putting it on hosing off the leaves and applying insecticidal soap or horticultural oil is the first line of defense.
What kind of light are you using, used any nutes?
As seen here the left leaf is wrinkled upwards greatly. Whenever your plant's leaves look pale, but the plant is otherwise healthy, try adding an organic liquid fertilizer first. The leaves weren't as blanched looking and very little red spotting in the new growth. There a powdery feel on hands.
