Why does my but smell like armpits i can't smell it but other people can can it be a bacteria infection ?

?Question: Odd question, but arm pit smell is usually from perspiration and any area on your body that perspires (sweats) can smell eventually. Try using a good powder to keep your buttocks dry to prevent the moisture form causing a stench. Use proper hygiene and clean yourself daily, even in the buttock area by bathing or showering with soaps. Doubt it is a bacterial infx, but if persists-see a dr.

See a doctor: Without being able to examine this there is no way in which to answer appropriately. Go and be seen. Good luck.