What can make an old man smell like rotting flesh? He said he washed everywhere and put fresh clothes on, so what could it be?

sage2021
HEALTH QUESTION
Updates
9 mo
If I take one of my prescription antihistamines, I don't smell anything. But when the pill wears off, the smell is back.
What can make an old man smell like rotting flesh? He said he washed everywhere and put fresh clothes on, so what could it be?
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