Ever wonder why some people have even skin tone, and some have freckles?
As it turns out, science has traced it all to one gene.
It’s called the Melanocortin 1 Receptor gene, or MC1R for short.
When your skin is exposed to UV radiation, it responds by producing melanin, or skin pigment.
For people who have a certain variation of MC1R, however, the melanocytes aren’t spaced evenly.
They’re clustered, so the melanin they produce is clustered as well.
This is also why people with freckles tend to sunburn easily…
…and why, when freckled people get some sun, they just get more freckled, while remaining pale.
In case you’re wondering, it is in fact the same gene that determines red hair color…
…but it doesn’t always correlate.