If you’ve ruled out the usual causes (because your hygiene is good enough), and you don’t have any medical conditions that cause people to smell bad, it may be an OCD obsession or another mental health thing.
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Anonymous#116w
I don’t say that in a judgmental way (I have OCD myself anyway) and it may not be that. But if you really feel troubled by a recurring theme that doesn’t quiiiite make sense, it can be reassuring to find out if there’s a name for it and possibly a solution, whatever that may be