A red, swollen and tender eyelid is often the sign of a stye or chalazion. These are infections or inflammations of the oil secreting glands in the eyelids. They are often associated with blepharitis. They can occur at almost any age.
Early treatment of these conditions involves applying a warm compress to the involved area for 10 to 15 minutes at least four times a day. Many times, this treatment will result in improvement of the condition. Sometimes, the glands become enlarged and have to be drained. Early treatment with warm compresses is the best chance to avoid needing to have the glands drained. If drainage is necessary, it can usually be done in the office with local anesthesia.
These conditions are medical conditions, and are usually covered by health care insurance.
To find out more about these conditions, click here: http://www.geteyesmart.org/eyesmart/diseases/chalazion-stye.cfm