I'm not positive what you are referring to, but if you mean is drinking coffee bad for your skin, I'll try to answer that. Coffee acts as a natural diuretic, meaning you lose water from your system more than what is coming in from the coffee. If you drink nothing but coffee, it can definitely be very bad for your skin. You will dehydrate slowly if you drink just coffee and your skin can become very dry and crepey looking quite quickly. Doctors will tell you to drink two glasses of water for every cup of coffee you drink for optimal hydration.