Thanks for posting.
Well I will like to know if by looking on the black spots on your face, stomach, hands and legs, you could tell if they have the same physical characteristics like intensity of color, margins or contours, surface ( rough or smooth) and the same touch. If you could clarify that it would be great. Now, from your description we could come up with several diagnosis depending on your age, race, location of the lesions, use of some drugs/medications, underlying diseases condition etc
- post inflammatory hyperpigmentation: post acne
- melanoma: skin cancer
mostly occurs in caucasians but can affect any other race
- melasma: sun burn lesions
- Riehl's melanosis
In any case, you will need a doctor to take look at the lesions and give proper diagnosis.
Treatment will depend on the type of lesion and in most cases of dark spots, treatment is not required and only the underlying condition or causative agents need to be controlled.
Hope this helps