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The tendency to develop freckles is often inherited and is linked to certain genetic traits. The MC1R gene, in particular, plays a significant role in determining skin and hair color and the presence of freckles. Individuals with variations in this gene are more likely to develop freckles, especially when exposed to sunlight.
Ultraviolet (UV) radiation from the sun is a major factor in the development and darkening of freckles. When the skin is exposed to UV rays, melanocytes (the cells responsible for producing melanin) produce more melanin as a protective response. This increased melanin can clump together, forming freckles.
Hormonal changes, such as those occurring during puberty or pregnancy, can influence melanin production and may contribute to the appearance or intensification of freckles.
People with fair skin have less melanin and are more susceptible to the effects of UV radiation, making them more prone to developing freckles. However, freckles can also appear in individuals with darker skin tones.