a spray under your armpits can cause burning and irritation. This can be especially true for people who choose to shave their armpits, as the potential irritation can be caused by your perfume coming into contact with the sweat glands in your armpits.
However, burning and irritation are not the only concerns. The lack of knowledge itself is another reason why you should not apply perfume to your underarms. A 2016 study published by PeerJ looked at the effect of antiperspirants on underarm bacteria and concluded that we’re still largely in the dark about the broader effects of these products on human health.
There is even less research on the effect of perfumes on underarm bacteria, which makes them a riskier prospect with few additional benefits compared to currently available deodorant products.