Oncidiums are so notorious to get those spots, like wintergirl I just ignore them too. Sometimes I think it maybe the water I use, although they tolerate tap water, but they look much happier as with all the plants do, if I use rainwater.
But rainwater is not a lot here, only this time that we have the effects of El Nino that we are getting good rain that I can try and save some for my plants use.
Do observe if it is spreading, at times, it just stays like that.
Allow the plant to acclimate some more.
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