South Carolina Cosmetology Practice Exam 2025 – Complete Prep Guide

The stratum corneum is the outermost layer of the skin, and its importance in skin care lies in its role as a primary barrier protecting the underlying layers of skin. This layer is composed of dead skin cells that have been keratinized, creating a tough, resistant surface that helps to keep moisture in and harmful environmental factors, such as pathogens and chemicals, out.

By maintaining the integrity of this barrier, the stratum corneum plays a crucial role in overall skin health. When the stratum corneum is intact and functioning properly, it helps to prevent trans-epidermal water loss, thereby keeping the skin hydrated and resilient. This barrier function is essential in skin care routines because any compromise to the stratum corneum can lead to issues like dryness, irritation, and increased susceptibility to infections.

Understanding the function of the stratum corneum highlights why it is a focal point in many skin care products that aim to strengthen or protect this barrier, contributing to more effective skin care practices.