If you have very sensitive skin, you may find regular antiperspirants and deodorants irritate your skin because of their alcohol content. If so, look for a deodorant with witch hazel, which is renowned for its skin-soothing properties. Witch hazel, which is derived from the bark and leaves of a shrub, works as an astringent in deodorants; it shrinks the pores in the armpit. It also causes any sweat that does escape from those pores to evaporate. As a bonus for those who shave their underarms, witch hazel is also often used in aftershaves, meaning that it can ease the pain of razor burn.