A healthy, natural, moisturizing facial mask to replenish moisture lost throughout the day is the best treatment for your skin in winters. Applying an oil-based moisturizer on your body supports your skin and will not block its natural sebum production. You can apply natural coconut oil, sesame oil, shea or cocoa butter, depending on how much moisture you need. If you have really oily skin even during winters, you can skip the use of oil.