Skin color images collected from Pakistani population (A-E) and characterized according to the Fitzpatrick Phototype Scale. This scale specifies six shades of skin color: A, very pale; B, pale; C, light brown; D, medium brown; E, dark brown; F, brownish black. Based on this scale, we used three categories to characterize skin color: 1, white and beige skin color (equivalent to A and B in Fitzpatrick classification), 2, light brown to medium brown (equivalent to C and D in Fitzpatrick classification), 3, dark brown to brownish black skin (equivalent to E and F in Fitzpatrick classification).