This can present as one of two forms or a mixture of both. The more dramatic is acute allergic blepharitis in which the eyelids swell up rapidly, often in response to contact with a plant or eyedrops. The cause must be found and eliminated and treatment with local steroids might be needed. Chronic allergic blepharitis is seen in atopic individuals, for example hay fever sufferers or patients with a history of eczema. The diagnosis might require a histological examination of the conjunctival discharge. Drop treatment to alleviate symptoms includes mast cell stabilisers (such as lodoxamide) and histamine antagonists (such as emedastine), and these agents could take weeks to take effect. Patients with seasonal allergic conjunctivitis might require medication for a prolonged period over the spring and summer months each year.
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