freckles

Freckles can appear from a young age, individually, while melasma is often caused by aging, in patches of different sizes, colors, and depths.

The freckles form because the melanin pigment is unevenly distributed under the skin, making the skin darker when exposed to sunlight.

A 35-year-old American woman has a rare form of breast cancer that is successfully cured by early detection of abnormal nodules on her chest.