Why do I freckle in the sun?

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Because your pigment system is genetically set to freckle, and sunlight is the trigger that flips it on. The dermatology review of freckling separates the two kinds: ephelides - the classic sun freckle - are largely genetically determined but induced by sunlight: UV hits, and your melanocytes respond by dumping pigment into the top skin layer in scattered patches instead of an even tan. Solar lentigines (sun spots) are different - those come from accumulated photodamage over years and do not fade in winter the way ephelides do. The genetics: MedlinePlus identifies MC1R as the major freckle gene - the same red-hair gene; certain variants produce patchier, less protective pheomelanin, which is why freckling clusters with red or blonde hair and fair skin. The honest health read: freckles themselves are harmless, but they are a reliable marker of sun-sensitive skin - the freckle-prone phenotype burns easier and carries higher skin-cancer risk, so they are your skin posting its own warning label. Protection is the same as for any fair skin: daily SPF, and watch any spot that changes, darkens asymmetrically, or looks unlike the others.

Why do I freckle in the sun?

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