How to determine the degree of your skin dehydration? 1.Mild dehydration: dull, yellowish skin tone, often oily, lack of luster. 2.Moderate dehydration: rough skin without makeup, fine lines immediately appear after applying foundation. 3.Extreme dehydration: rough skin texture, large pores on the nose, fine lines are becoming more and more obvious. 4, severe water shortage: fine lines evolved into long and deep dry lines, even without powder is clearly visible, forehead and eye wrinkles appear, facial skin is often red.