Skin Dry And Flaking Due To Cold Weather And What Are The Brown Spots On Cheeks?

Before this winter i had very smooth skin , but once winter came by , the wethear turned too cold , my skin turned very dry and started flaking off , if i touched my cheeks , skin started coming off as very small white particles . Now some part of my cheek has light brown spots that are only visible if observed closely but from far skin does nt appear very smooth. I am not sure if they are skin pores . I wanna get rid of it . please help . Also does face skin really replace itself , If yes then in haw many weeks/ months/years . Please help me in this . Thanks in advance