Various reasons: The conjunctiva, which lines the surface of the eye, can develop patches of pigmentation over the years to have a "muddy" appearance. Yellowish spots on the inside and outside of the iris called pinguecula are also normal changes, usually related to exposure to sun and wind. Redness can be from allergy, dry eye, and other causes. Any new pigmented place on the eye in a caucasian should be checked.
Answered 11/6/2015
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