Reaching the earth usually increases in summer and decreases in winter. They have a 10 times higher risk than African Those at highest riskĪre European Americans. In the United States, approximately 54,000 people get thisĪggressive type of skin cancer every year and Result in DNA changes and, subsequently, several kinds of By doing this, it helps to prevent sunburn damage that could Nature has selected for people with darker skin in tropical latitudes,Įspecially in nonforested regions, where ultravioletįrom the sun is usually the most intense.īiological shield against ultraviolet radiation. Produce melanin within a few hours of exposure. These cells have photosensitive receptors, similar to those in the eye, thatįrom the sun and other sources. It is produced at the base of the epidermis by specialized To a lesser extent, the color is affected by the presenceĪ reddish-orange pigment in the skin. In lighter skin, color is also affected by red cells in bloodįlowing close to the skin. Important in determining skin color than the percentages of the different In addition, individuals differ in the number and size of Produce pheomelanin, while those with dark colored skin mostly produceĮumelanin. People with light complexioned skin mostly Which is red to yellow in color, and eumelanin , However, two forms are produced-pheomelanin , (Sub-Saharan African, Indian, Southern European, and North ernĭue primarily to the presence of a pigment called melanin ,
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