Exposure to harmful UV radiation of the sun leads to an increase in the production of melanin in your skin. Melanin refers to the pigment that gives colour to your skin that give colours to your hair skin and even eyes. This increase in melanin will cause your skin to darken in a period of about 48 hours. Melanin protects your skin from further damage by offering a sun protection factor from 2 to 4. However, the minimum SPF that is recommended to be applied to your skin before it is exposed to the sun is at least 15.
Therefore, there is a need to take the necessary precautions before going out in the sun. Also, you need to do something about removing the tan that has darkened your skin; if not, it is known to increase your risk of developing skin cancer.