Both drugs had been previously recommended for approval 14-0 by members of FDA's Anti-Infective Drugs Advisory Committee. The significance of two new antibiotics in four weeks? We've recently been averaging one antibiotic every three years.
More melanin presence in the skin makes the skin appear black, and less melanin will make the skin appear less black. White people have very little melanin synthesized by their skin. So, the color of the races is because of some difference in the quanitity of the melanin pigment in our body. That is all.
The rate at which melanin granules are formed in these cells and their concentration in the epidermis are inherited characteristics and major factors in skin color differences. When no melanin is produced, the involved patch of skin becomes white. When a white patch grows or spreads, the cause may be vitiligo.