this can be a few things.
it can be hormonal, sometimes estrogen and progesterone level changes can darken the skin anywhere
lupus can cause facial rashes (usually under the eyes and over the nose) but unlikely
age (again youre young but its possible
sun damage
benign or malignant neoplasm of the skin
i would get them checked by a dermatologist just to be sure. anyway the best treatment to bleach them is by prescription called hydroquinone. the otc ive seen havent been effective.
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