Which layer of skin is responsible for containing melanin and serving as a barrier against water loss?

The epidermis is the outermost layer of the skin and plays a crucial role in protecting the body. One of its key functions is the production of melanin, the pigment responsible for skin color, which helps to protect skin cells from the damaging effects of ultraviolet (UV) radiation. Additionally, the epidermis acts as a barrier to prevent excessive water loss from the body, maintaining hydration and overall skin health. It achieves this through the presence of keratinocytes, which produce keratin, a protein that helps create a waterproof barrier. Consequently, the epidermis serves both as a protective layer and a regulatory barrier, making it essential for maintaining skin integrity and protecting against environmental factors.