Sir, black spots in other words black moles developed around 40 in thighs and hands each part 10 moles.

Dark moles. Dark moles can be freckles but also can be a melanoma or a dysplastic nevus (precancerous condition). With such a fast growth you must get checked by a dermatologist. This is especially true if you are fair skinned and have history of sun expousre.
See a dermatologist. It may not be moles. I would suggest a dermatologic consultation for proper diagnosis and treatment.