16. Another skin issue is your hands. Keep your hands safe after you moisturize by wearing cotton gloves, because this will lock the moisture.
17. By eating unhealthy food, you can develop cold sores. Also, stress is another risk factor, so try to reduce stress and the intake of unhealthy food.
18. Your body produces less vitamin D in the winter, because you are not very exposed to sunlight, so you should take some vitamin D pills.