If you see someone with a big booger in their nose, do you tell them about it or not?

sage2021
My former boss had a big booger in his nose at work one day. I just couldn't get up the nerve to tell him about it. So he was walking around the office and interacting with coworkers with that in his nose. No one told him either. He was a really easygoing kinda guy and probably would have rather someone tell him about it, but he'd be terribly embarrassed. So, was it wrong to keep him from knowing about it?
If you see someone with a big booger in their nose, do you tell them about it or not?
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