Any animal’s eye color is determined by its levels of two melanin pigments: eumelanin, which makes brown-black, and ...

You can also develop iris nevi, which are dark growths on your eye that look like a mole and are in fact caused by the same pigment cells, called melanocytes. While most aren’t dangerous, they can ...

Bacterial conjunctivitis can cause a red eye that may or may not have a mucus discharge. Bacterial conjunctivitis can resolve without treatment, or it may be treated with antibiotic eye drops. It ...