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Largest organ. Your skin is your largest organ. It covers your entire body and has a surface area of around 2 square metres. Its thickness varies from 0.5mm on your eyelids to 4mm or more on the palms of your hands and the soles of your feet. In total, it accounts for around 16 percent of your body weight.
Dead cells fill with keratin, a strong protein. These keratin-laden cells comprise the outer layer of the epidermis, providing the body with much-needed protection. Because the body continually sheds old cells, replacing them with new, humans have an entirely new skin surface every 20 to 30 days.