This skin cancer without pigment usually develops more slowly.

CNN: What causes pyogenic granuloma?

Melanoma, a cancer of the skin's melanocytes, or pigment cells, hits 60, 000 Americans each year and kills 8, 000 of them.

FORBES: Targeting Melanoma

Albinism is a genetic condition that leads to little or no pigment in the eyes, skin and hair.

CNN: STORY HIGHLIGHTS