What smells is bacteria that causes body odour an ofcourse its in the moisture or sweat. But when we sweat we sweat all over right? Our foreheads, legs, arms. Ive never had a bad odour coming from the seat on my fore head but bactria under thenm arm are protected by its enclosed space all day and night. Ive heard some plants kill the bacteria. Cleaning under the arms with an anibacterial lotion will help along with keeping the moisture bacteria thrive in out of your arm pit with regular applications of baby powder.