At zero degrees Celsius, the cold sucks out moisture from the skin making it more sensitive. Further drops in temperature will cause the skin to be dry, red and rough. Conversely, the rise in UV Index to level 6 during summer can cause sunburn in half an hour if you have fair skin and have not put on sunscreen. Seasons change – and so should our skincare regimen to keep the largest organ of our body healthy and youthful. "Just as you change your clothes with changing temperatures you should do the same with your skincare," says dermatologist Dr Nick Lowe.