his dark mass on skin, a form of skin cancer, is directly due to

Skin cancer in skin of color - Journal of the American Academy of Dermatology

a
the uncontrolled mitosis and growth of abnormal cells.
b
production of excessive protein inhibitors.
c
meiotic division of normal cells.
d
the crowding of released antigens.

a) the uncontrolled mitosis and growth of abnormal cells.