Which of the following describes a pterygium?

A pterygium is characterized as a growth of fleshy tissue that extends onto the cornea from the conjunctiva, which is a clear membrane covering the eye. This tissue can appear somewhat triangular in shape and typically forms on the inner corner of the eye, extending towards the center. It commonly occurs in individuals who have significant sun exposure, leading to irritation and growth over time. This tissue growth can sometimes affect vision if it enlarges or induces astigmatism.

The other choices do not accurately describe a pterygium. Redness of the eye refers to inflammation or irritation, which is not specific to pterygium. A type of sore throat does not relate to eye conditions and a form of conjunctivitis describes an inflammation of the conjunctiva, which is distinct from the growth of a pterygium. Thus, the description of flesh-colored tissue encroaching the cornea precisely defines a pterygium.