Question

why do our clothes develop white patches in the areas of our under arms

Answer 1

underarms is a closed and a dark place where light cannot directly enter
bromhidorsis and osmidorsis are the bacteria that grows there
it gives bad odour
it reacts with the dress we wear anticolourant or bleaching effect is poured their that removes the colour
precautions:
they can be killed by spraying deodrants it doenot allow the bacteria to grow and causes decolourant of the dress

Answer 2

Answer:

When we sweat more in order to cold body . The sweat contains salt and when it dries from clothes the water evaporates and the salt is left behind. This forms white patches on a clothes