PlantPalHard bumps on stems: check for scale
Scale insects can look like small shells stuck to stems or leaves.
What to check first
Look along stems and leaf veins for separate, attached bumps. Some types leave sticky residue. A bump that is part of the plant tissue may be a natural feature or edema.
What to do now
Separate the plant. If you see only a few insects, gently lift them off with a cotton swab or a fingernail, without scraping healthy tissue. Inspect hidden joints and neighboring plants.
What to watch next
Check the same areas weekly for new bumps. Small young insects can appear after the adults are gone. If large numbers keep returning, get advice for the type of scale.