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Why Does A Tan Disappear?
The "tan" or pigmentation process, occurs in the epidermis, the top skin layer. The epidermis replaces all its skin cells every 28-30 days. Cells in the inner portion of the top skin layer themselves, migrate to the surface, and as a result of UV exposure, rise to the surface and flake off. Therefore, a tan can be maintained only by repeated exposure to UV light.
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