What is the outermost layer of the skin called?

The outermost layer of the skin is called the epidermis. This layer serves as the first line of defense for the body against environmental factors such as bacteria, UV radiation, and moisture loss. The epidermis is composed of several sub-layers, primarily made up of keratinocytes, which produce keratin, a protein that helps to protect the skin.

In addition to its protective role, the epidermis also contributes to skin pigmentation through melanocytes, which produce melanin. This pigmentation is vital for skin protection as it absorbs harmful UV rays.

Understanding the structure and function of the epidermis is crucial for estheticians, as many procedures and treatments target this layer to improve skin health and appearance. Other layers of the skin, such as the dermis, hypodermis, and subcutaneous layer, play different roles in skin support, nourishment, and insulation, but they do not serve as the outermost protective barrier.