1.   In humans, malignant melanoma - a cancer of the cells containing skin pigment - is a particular hazard of excess sunbathing.

2.   Albinos lack normal skin pigment.

3.   As humanity migrated south to escape the advancing ice, the different skin pigments were developed.

4.   Melanomas develop when a melanocyte, a cell that produces skin pigment, begins to behave abnormally.

5.   Q. Is there any treatment for vitiligo, the loss of skin pigment that leaves white patches on the body?

6.   This led to different geographical groups evolving at least four varieties of skin pigment to prevent sunburn.

7.   The ancient Egyptians and Chinese used mercury as a skin pigment.