Herpes zoster, commonly known as shingles, is caused by the same virus responsible for chicken pox. After the initial exposure, herpes zoster lies dormant in certain nerve fibres. It may become active as a result of many factors such as: aging, stress, suppression of the immune system, and certain medications.
It usually presents as a painful rash involving one side of the forehead, the upper eyelid, side of the nose and can also involve the eye. Early treatment can help prevent some of its long-term repercussions, such as post-herpetic neuralgia.