I hate this. I hate when this happens. Gives me the heeby jeebies. It has never happened to me (10 or 15 years on Dex), but it does happen every now and then. People post about it.
Last saw this issue pop up in February on the forum. He did a good post. @Robr
Sometimes Docs tell people not to worry about it and just leave it there. I dunno what the right thing to do is.
This forum member is actively around, so she might be able to answer questions.