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Let me clarify
You can't smell it.
Your doctor can?
The problem can be internal, such as from diabetes, or a hormone problem.
I think your doctor wants to send you to an endocrinologist.
In the meantime, bacteria are responsible for the smell.
They feed on dead skin.
Take a natural dry brush and brush all over before a shower ever day.
Use only ivory soap or castille baby soap to wash.
See an endocrinologist.
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I disagree with the above advise
I would advise you to see and ENT doctor. Since this is not a dental issue, ENT would be the second most common source. It is likely to be a chronic infection of some sort in that area, but it requires a detailed ENT assessment. This is not an endocrine problem