The skin is your body’s largest organ. It’s tough, elastic, and depending on where it is on your body, it can be between 0.5 and 4mm thick. It makes up 16% of your bodyweight. The skin is made up of 2 layers; the epidermis, which is the outer layer, and the dermis, which is the deeper layer.
Cells in the epidermis constantly divide to make new cells. The new cells make their way to the surface of the skin where they die and are filled with a protein called keratin, which forms a protective barrier against damage, infection, and dryness. Every 30 days, your body produces a new epidermis.
The dermis is made up of strong collagen and elastic fibres which 24are surrounded by blood vessels. It also contains touch, pressure, and pain sensors as well as hair follicles, sweat glands and oil glands. The oil glands produce sebum which keeps your skin lubricated.