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A Biologist Explains Why Some Humans Get Freckles And Others Never Do

Why do some people get freckles and others don't? A biologist breaks down the genetics, sun exposure and evolutionary trade-offs behind them.

Scott Travers, Contributor Forbes 07 Jul 2026, 08:00 1 min read 4/10

A Biologist Explains Why Some Humans Get Freckles And Others Never Do

Key Takeaways

The MC1R gene on chromosome 16 determines freckle formation; variants cause melanocytes to produce pheomelanin instead of eumelanin, creating freckles.
Approximately 1–2% of the global population carries the two main variants of the MC1R gene that cause red hair and freckles.
Freckles appear after repeated sun exposure — they fade in winter and darken in summer, acting as a natural UV exposure indicator.
People of Celtic and Northern European ancestry have the highest prevalence: up to 40% of Irish and Scottish populations have visible freckles.
Freckles are benign; they do not increase skin cancer risk by themselves, but the lighter skin associated with MC1R variants does increase sensitivity to UV damage.

Freckles are not random — they are a genetic trait influenced by a single gene, sun exposure, and evolutionary history. Biologist Dr. Scott Travers explains why some people develop these tiny pigment spots while others never do. The key lies in the MC1R gene, which controls melanin production. People with certain variants produce more pheomelanin (red-yellow pigment) than eumelanin (brown-black), leading to lighter skin, red hair, and freckles. Sun exposure triggers freckles because UV radiation stimulates melanocytes to produce melanin, but in MC1R variants, the melanin clumps unevenly. Freckles are more common in people of Northern European descent, but they appear across ethnicities. The evolutionary trade-off: freckles are linked to lower skin cancer protection, but in low-sunlight regions, they allowed better vitamin D synthesis. Today, about 50% of people with red hair and 30% of people with fair skin have freckles. Key figures: Dr. Scott Travers (biologist, Forbes contributor). The article emphasises that freckles are harmless and serve as a visible marker of a person's unique genetic makeup. Understanding freckles helps explain broader patterns of human adaptation and skin health.

"Freckles are a sign that your skin is reacting to sunlight in a unique way — they're not a defect, they're a feature of your genetic heritage."

"The same gene that gives someone red hair and freckles may have helped their ancestors survive in cloudy, northern climates by boosting vitamin D absorption."

Frequently Asked Questions

Freckles are caused by a combination of genetics and sun exposure. The MC1R gene regulates melanin production; certain variants lead to uneven melanin clumps that appear as freckles when exposed to UV light.

Yes, freckles are inherited. The MC1R gene has variants that are passed down from parents. People with two copies of the recessive variant are more likely to have red hair and freckles, but even one copy can cause freckling in fair-skinned individuals.

People without freckles have MC1R gene variants that produce even melanin distribution, protecting the skin from UV-related spotting. Darker skin types with more eumelanin also naturally block freckle formation.

Freckles themselves are benign and not a sign of skin cancer. However, the fair skin associated with freckling is more susceptible to UV damage, so people with freckles should use sun protection.

Freckles can fade over time, especially with reduced sun exposure. They may become less noticeable in old age as melanocyte activity declines, but their genetic basis remains.

Original source

www.forbes.com

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