Hypopigmentation is characterized specifically as an area of skin becoming lighter than the baseline skin color, but not completely devoid of pigment. This is not to be confused with depigmentation, which is characterized as the absence of all pigment. It is caused by melanocyte or melanin depletion, or a decrease in the amino acid tyrosine, which is used by melanocytes to make melanin.
Dull skin is basically just that; skin that has lost its luminosity and brightness over a period of time. In some individuals however, dull skin exists from the moment of birth. Dull skin has an unhealthy look that can be attributed to a few factors. Lifestyle habits and your environment also have considerable effects on the health and state of your skin.
You can get fine lines from seemingly everything in life. If you are exposed to the sun, pollution, or smoke; you can get fine lines. If you have a familial trend of getting fine lines or if you’re reaching a certain age, you may notice fine lines forming on your face. With so many, inevitable causes of fine lines, it might seem like it’s impossible to prevent them, but not quite.