Probably a mild case of edema (also sometimes spelled oedema).
It can be caused by uneven watering; a response to too much water during growth, or sometimes temperature changes.
Mild cases are not harmful. They are more of a symptom (in people, compare to a sneeze). There is no treatment needed, but those bumps won't go away. My plants are often outside in proper weather (like right now) so I rarely have plants that are totally free of edema. Indoors, if you are watering normally but occasionally water too much, you might see this symptom, though I think it is likely to be more of an issue outdoors.
Last edited by Orchid Whisperer; 07-03-2021 at 08:44 AM..
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