Is there an over the counter medicine to cure a stye?

A stye is an infection that causes a tender red lump on the eyelid. Most styes occur along the edge of the eyelid.

7 Things to Know About an Eye Stye - AllAboutVision.com (http://www.allaboutvision.com/conditions/styes.htm)

You can use lysine ointment to treat styes.