The temptation in winter is to downright coddle our skin with rich oils and hydrating creams. But exfoliating in winter actually plays a crucial role in making sure all that hydration is effective. “Between the cold weather and dry heat, your skin dehydrates and dead skin cells build up,” Dr. Marina Peredo explains. Doing so, and sloughing away these accumulated dead cells is actually crucial to allowing serums, moisturizers, and all those other products to actually sink in and work. “Our skin naturally exfoliates itself,” Dr.