Why Are My Armpit Stains Yellow?
Armpit stains are generally caused by a combination of sweat and bacteria, which is why they often appear yellow in color. Sweat contains a protein called keratin which can react with the bacteria on your skin, causing a yellow discoloration. Additionally, antiperspirants or deodorants can add to the staining if not fully removed during washing. To prevent and remove armpit stains, it is important to regularly wash your clothing and use antiperspirants or deodorants that are aluminum-free.