07/24/2026
Your skin is made up of three main layers, each with a different job. The outermost layer, called the epidermis, acts as the body’s protective barrier. It keeps harmful bacteria, viruses, and chemicals out while helping prevent water from escaping. This layer is constantly replacing itself as old skin cells are shed and new ones are produced.
Beneath the epidermis is the dermis, a thicker layer that gives the skin its strength and flexibility. It contains collagen and elastin fibers, along with blood vessels, nerves, sweat glands, oil glands, and hair follicles. The dermis allows you to feel touch, pressure, pain, and temperature while helping regulate body temperature through blood flow and sweating.
The deepest layer is the hypodermis, also called the subcutaneous tissue. It is made mostly of fat and connective tissue that cushions the body, stores energy, and provides insulation to help maintain body temperature. Together, these three layers protect your organs, regulate your temperature, support sensation, and create the body’s largest organ.
