mine as well by those unslightly sweaty armpit Yellow staines . Does anyone know what causes this . Is it just sweat or is it a body chemical mixing with the deodorant
We have 2 types of sweat glands ....we have millions all over the body that surface through the skin's pores and these are responsible for cooling the body temperature.
The glands in the armpits, groin and anal area are a different type of sweat gland, instead of surfacing through a pore, they surface through a hair follicle and the type of sweat they produce is different in composition to the other millions of glands on the human body.
The sweat they produce contains proteins and fatty acids, which makes it thicker and a "milky" or yellow colour and although sweat itself has no odour, when this type of sweat comes into contact with bacteria on the skin and hair, it produces odour.
This is why we apply deodorant under the arms and not all over the body.
http://www.rd.com/advice-and-know-how/remove-perspiration-stains/article24615.html
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