Which layer of skin is responsible for skin tone?

The epidermis is the correct choice, as it is the outermost layer of the skin and plays a primary role in determining skin tone. This layer contains melanocytes, the cells responsible for producing melanin, which gives skin its pigment. The amount and type of melanin produced by these cells result in various skin tones seen across individuals.

The epidermis is also composed of several sub-layers, but its focus on pigmentation is primarily linked to the presence and activity of melanocytes. Factors such as sun exposure, hormonal changes, and genetic predisposition can influence the activity of these cells and, consequently, the skin tone.

In contrast, the dermis, although crucial for the overall health and structure of the skin, does not directly influence the tone since it comprises connective tissue, collagen, and various other structures such as hair follicles and sweat glands. The hypodermis, or subcutaneous layer, primarily serves as insulation and energy storage, rather than affecting skin pigmentation. Lastly, the stratum corneum is the outermost layer of the epidermis consisting of dead skin cells, which acts as a barrier but does not have a role in determining skin tone itself.