Does ending your shower with cold water really close pores and decrease the chances of break outs?

What is the logic behind this? I would assume your pores would just open back up once you stepped out of the shower and into a warmer enviorment, thus allow bacteria/oil to seep back in...|||well you wash your face in a steaming shower to open up your pores and allow the substance to clean your skin, and then rinsing your face with cold water does work, it closes your pores, natural warm environment doesn%26#039;t exactly open your pores, not hot enough.|||when your skin comes in contact with hot water or steam pores open up allowing u to clean out your pores and the cold water closes them up allowing the pores to not get more bacteria in them.|||yeah your right... hmmm really you dont need to do the cold water thing unless you open the door or window to let the hot air out so that way your skin can close