Hi there. So, is the 'rot' part wet and mushy? Some orchids will have black spots, but if it is hard and does not give way, it might not be a problem. One thing you can do, if you think it is rot, is cut away the rot and then pack cinnamon into the wound. This dries out the area, making it difficult for the bacteria or fungi to survive, and cinnamon does have antibacterial and fungicidal properties. Personally, it has saved me many orchids.
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You can also cut away the rot area and use a lighter to cauterize and disinfect the wound. Then pack it with cinnamon again. This might not work, depending on how you do it, but it has always worked for me on brassias, phals, and other orchids.
Also, it does not look like crown rot, but if rot, stem rot, given that it is on the outside of the stem.
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