The herpes zoster is caused by the same virus of chicken pox. After the initial patient’s infection by the herpes virus, the virus is “standby” in certain nerve fibers. However, it can become active as a result of many factors such as aging, stress, immune system suppression and usage of several medications.
The chalazion is a slight bulging of the eyelid and is caused by the obstruction of a gland, which is called meibomian. This gland contains an oily substance which is mixed with the tears, so as to prevent tears evaporation.
Entropion is called the condition where the eyelids (especially the lower one), is directed inwards. It may happen due to eyelids' muscles contraction, after a scar which is created after a wound, or even after inflammation from several eyelids' diseases.
Blepharitis is a common inflammatory condition, which affects the eyelids. Usually the patients report burning and redness of the eyelids. In severe cases blepharitis may cause barley, inflammation and irritation of the cornea (keratitis) and conjunctiva (conjunctivitis).