Every mark your Skin Explained #explained #learnontiktok

Every mark on your skin explained, freckles. You weren't born with a single freckle. Babies come out with completely clear skin. And the first ones usually show up around the age of two or three, right after the first summers in the sun. Under your skin are cells called melanocytes. They make melanin, the brown pigment that protects you from sunlight. In most people, they spread it out evenly, and you get a tan. But in freckled skin, some of these cells work much harder than their neighbors. They pump out extra pigment in small clusters, and each cluster becomes a dot. The reason is mostly one gene, called MC1R. Certain versions of it make your skin worse at tanning and better at freckling. That's why so many people with red hair are covered in them. And freckles change with the seasons. In summer, the sun switches those busy cells into overdrive, and the dots get darker and multiply. In winter, they slow down, and many freckles almost disappear. Then there's a second kind that looks similar, but isn't. Sunspots show up later in life, after years of sun, and they don't fade in winter. They stay. Freckles themselves are completely harmless, but they're also a warning. Skin that freckles easily burns easily, too.