Allergic conjunctivitis is the clinical term of ocular inflammation of the lining or membrane of the eye, called the conjunctiva, caused by allergic reactions to substances. Although a patient may present with red or pink eyes from excess inflammation, the common term pink eye can signify a broad term of conditions and can be misleading, as viruses, bacteria, fungi, and other irritating substances can cause redness resembling a pink eye. Your eye doctor can differentiate between an allergy reaction and a true infection, which can lead to faster healing with proper treatments.