When asked what the largest organ in the human body is, many people guess the liver, the brain, the intestines or even the lungs. But the truth is that the largest organ you have is actually your skin. Your skin protects your internal organs from injury, regulates body temperature and contains nerve cells that create the sense of touch.
In order to better understand skin conditions, you should understand the structure of the skin itself. There are three layers that make up the skin, the epidermis, the dermis and the subcutis.
The epidermis is the outer layer of skin and is, itself, made up of three layers; the basal layer, the keritinocytes and the stratum corneum. The stratum corneum is the very outermost layer of skin and is made up of dead cells that have been shed from the underlying keritinocytes and basal layers. The keritinocytes produce what the skin needs to protect the body. The basal layer forms new keritinocytes. The epidermis also contains melanocytes, which produce skin pigment (melanin).

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