Bad body odor could be in your DNA, dermatologists revealed. While nearly everyone sweats, it turns out your genes could determine how much you perspire and how smelly you get. Heather Kornmehl, a Texas-based dermatologist, informed her 111,000 TikTok followers that whether you get smelly as the day progresses or during a strenuous workout may be out of your control. Some people are more likely to have a foul odor after a hard workout or a long day than others due to variations in the ABCC11 gene, which is responsible for producing underarm body odor.