Which skin layer contains hair follicles?

The dermis is the layer of skin that contains hair follicles. This layer lies beneath the epidermis and is rich in connective tissue, blood vessels, and various structures, including hair follicles, sweat glands, and sebaceous (oil) glands. The presence of hair follicles is crucial for the process of hair growth and maintenance.

The epidermis, which is the outermost layer of skin, does not contain hair follicles. Instead, it serves primarily as a protective barrier. The hypodermis, also known as the subcutaneous layer, lies beneath the dermis and is mainly composed of fat and connective tissue, providing insulation and cushioning, but it does not house any hair follicles. Therefore, the dermis is the correct answer, as it is the only skin layer that contains and supports the growth of hair follicles.