Impure skin may have a variety of reasons and is no question of age: It may occur during puberty, menopause,
pregnancy or stress. Bacteria, environmental influences, wind and weather stress skin as extrinsic factors
on the one hand, but it may also be caused by medicaments, hormonal oscillations or diseases as
intrinsic factors on the other. The appearance is characterized by shiny,oily areas, comedones, 
pustules and blemishes, deposits, scars and enlarged pores.