How do you "close" your pores on your arms & legs?

and how do you keep them closed?|||Ive heard that after taking a warm shower turn the water to cold for a few seconds, its suppose to close the pores and also make your hair shine more.|||I%26#039;ve never really heard of pores on your arms and legs, but I do know that a cool water rinse in the shower is supposed to seal moisture into your skin. And, it closes the cuticles in your hair.