What accounts for smells on the skin is the type of bacteria on the skin.
Things you have smelt do not get trapped in your nostrils and cause chronic smell problems.
Foul smelling skin can also indicate liver, kidney disease or diabetes.
You need to see your doctor to rule out these problems.
Over the counter products can have substances which affect the smell of the breath an skin, in some cases. However, this should stop once you stop the product.
If no one else smells this besides you, then seizure disorders and tumors can cause fictitious smells, and this is more reason to see an internal medicine doctor, such as myself.
I am a double board certified US doctor with over 20 years of clinical experience.
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Let me know if you have questions.