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Author: A/Prof Amanda Oakley, Dermatologist, Hamilton, New Zealand, February 2016.
An ephelis is a freckle, a small, light brown or tan mark on the skin.
The plural of ephelis is ephelides. The can be hundreds or thousands of them on exposed skin.
Ephelides are particularly common in fair-skinned Celtic children. They are not present at birth. People with white skin that cannot tan (Fitzpatrick skin phototype 1) often have red hair and numerous ephelides. Ephelides can also occur in other races that have dark brown or black hair.
Ephelides are an inherited characteristic. People with many ephelides have at least one copy of a variant MC1R gene, which is the same variant that causes red hair. Freckles in non-Caucasians are associated with a different variant of the gene.
The pigment-forming cells, melanocytes, produce more pigment than usual in ephelides. The pigment is packaged as melanosomes and distributed to surrounding keratinocytes.
Ephelides increase in number following exposure to ultraviolet radiation in sunlight.
Ephelides are found on sun-exposed sites, particularly the nose and cheeks.
Ephelides are usually diagnosed clinically. However, from time to time, the diagnosis is made by a histopathologist after skin biopsy of a pigmented lesion.
No treatment is necessary. Occasionally, people seek treatment for ephelides. They can be advised to protect affected areas using broad-spectrum, sun protection factor 50+ sunscreen.
As they are an inherited characteristic, they cannot be prevented. However, the summer darkening can be reduced by careful sun protection.
Ephelides are particularly prominent in children. They often become less obvious in adult life.
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