Males from one pool sported vivid blue and orange splotches along their sides, while those further downstream carried only modest dots of color near their tails. Endler also observed differences ...

Dark spots on the skin, or hyperpigmentation, occur due to an overproduction of melanin. Melanin gives the eyes, skin, and hair their color. Depending on the cause, people may call some types of ...

Some birthmarks, such as dermal melanocytosis, salmon patches, and strawberry nevus, fade over time, while moles, port-wine marks, and café au lait spots are lifelong. New or unexpected color ...