I have a prominent chin and I have a chin pit.
Someone was kind enough to point out after I had washed my face that my chin pit has its own distinctive scent!
There are all manner of hair care products, and skin cleansers and all types of deodorants so why not a deodorant stick just for a chin?
envision an applicator the size of a lip balm.
Could be a double ended version lip balm on one side and chin deodorant on the other.
Not certain what I would want by way of scents to choose from but it should defeat the smell.