If your skin suddenly feels drier, duller, more sensitive, or more prone to breakouts, perimenopause could be part of the reason. Perimenopause is the transition before menopause. It usually begins in the 40s, though it can start earlier. During this time, estrogen levels fluctuate and gradually decline, which can affect collagen, oil production, hydration, and skin barrier function. As these changes build, skin may look thinner, less firm, and less resilient than it used to.