Conjunctivitis is an inflammation of the conjunctiva (mucous membrane covering the eyeball) usually caused by a virus or bacteria, but may also be caused by an allergy, in which case it is called allergic conjunctivitis. Such as dust, mold, pollen or certain chemicals are the most common causes of this inflammation. In addition, conjunctivitis spreads contact items that have been manipulated by the patient who suffers (such as the towels). Its most common symptoms are: red eyes, increased sensitivity to light, tearing, itching, feeling that something is stuck inside, or gummy appearance. Makeup is advisable to stop for a few days, do not wear contact lenses, wipe his eyes with cold compresses to relieve discomfort and apply pharmacological treatment prescribed by the doctor. Treatment generally includes corticosteroids eye drops and drops, in the case of allergic conjunctivitis, and antibiotic in other cases.