Dull skin is a very common condition that refers to a number of flaws that make your skin look flat and lacklustre. Our skin unveils a fresh and rejuvenated look naturally when its upper dead layers are shed. But with extreme temperature, improper lifestyle and underlying health conditions, the skin may begin to lose its natural complexion and youthful appeal. It may also lack its usual radiance and glow, which makes it look dull and lifeless.