There are many tales of meanings for the black spots It is just melanin.If you look at this photo the inside of the mouth and the gums being dark would be good sign of pigment
Melanin: The pigment that gives human skin, hair, and eyes their color. Dark-skinned people have more melanin in their skin than light-skinned people have. Melanin is produced by cells called melanocytes. It provides some protection again skin damage from the sun, and the melanocytes increase their production of melanin in response to sun exposure.
Freckles,
which occur in people of all races, are small, concentrated areas of increased melanin production.)
