A stye is inflammation of the lower or upper part of the eyelid that shows as pimple or abscess. The inflammation is due to the obstruction of an oil duct along with microorganisms such as bacteria, which is on the surface of the eyelids.
The microorganisms and dead cells of the skin are deposited along the eyelid. Styes are actually harmless, and they do not affect eyesight but may result in some errors of refraction. Pink eye, also known as “conjunctivitis,” refers to the redness and the swelling in the conjunctiva. Conjunctiva is the mucous layer that lines the eyelid and also the eye surface.
Pink eye is usually caused by an infection, and the irritation which results from infection leads to the redness and swelling in the conjunctiva. It is a contagious disease (since it is caused by viruses or bacteria); however, it goes away in 7 to 10 days.