Episcleritis is a common condition affecting the episclera, the layer of tissue between the conjunctiva and the firm, white part of the eye called the sclera. It may present as an area of redness on the white of the eye or sometimes, there may be a small nodule in the middle of the red area. In episcleritis, the episclera becomes inflamed and red. It often causes irritation, soreness or a gritty sensation. Episcleritis can also be recurrent. The cause of episcleritis is mostly unknown. It sometimes flares up when you are tired, have been reading or working for long periods on computers, or are in a dry, dusty environment. In most cases, episcleritis recovers on its own and may not need any treatment, but the symptoms can be relieved using artificial tear drops. If it persists and causes significant discomfort, you may need a short course of steroid drops to help it clear.