Having freckles is genetic. Freckles are formed randomly on the skin after exposure to sunlight. The melanocytes (special skin cells responsible in production of skin pigment called melanin), when exposed to sunlight result to increased production of melanin. Melanin production is the skin’s best way of protecting the skin from the harmful rays of the sun. Melanin builds up in one place resulting to a flat, rounded spots called freckles with a size of about 2-4 millimeter. It may vary in color such as red, yellow, tan, brown, light-brown or black but are always darker than the skin’s natural color. Further exposure to sunlight can even make freckles darker.
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