Freckles

Freckles, or ephelides, are small light-brown marks that appear on sun-exposed skin, most commonly in people with fair skin and red or light hair. The genetic basis is well established, largely variants in the MC1R gene, and the pattern usually appears in childhood.

What separates them from sunspots is behaviour over time. Freckles are seasonal — they darken through summer and fade substantially in winter — and they are not damage in the way a solar lentigo is. Sunspots appear later, have sharper borders, do not fade seasonally and accumulate with cumulative exposure. Under the microscope the difference is real: freckles have a normal number of melanocytes producing more pigment, while lentigines have more melanocytes.

Treatment is therefore a choice rather than a need. If you want them lighter, the tools are the same as for any pigment — sunscreen first, since sun is what darkens them, then tyrosinase inhibitors and gentle exfoliation, with lasers as the decisive option. Many people would rather keep them, which is a perfectly reasonable position for a feature that is not pathology.

The medical note that matters: freckling is a marker of the skin type most vulnerable to UV damage. Whether or not you treat the pigment, the sun protection is worth doing for the skin underneath it.