>>13900205I am lazy to write so I copy some of it.
"Three genus of bacteria are key in producing human scent – Staphylococcus, Corynebacterium and Propionibacterium. These bacteria metabolize sweat, a human byproduct, to produce a waste product, which has a distinct odor."
You sweat more in those areas, because there is more heat there, so there is more bacteria there and there is more smell there.
Why don't you mind it? You are used to your own smell and became desensitised to it, but others are not so I advise you to shower regulary or you won't have any friends.
