Well, generally speaking, you are not supposed to go to school when you have pink eyes, for they are highly contagious. First, you should know that pink eye, is redness and inflammation of the membranes covering the whites of the eyes and the membranes on the inner part of the eyelids. The common cause of pink eyes can be irritation, allergies, eyestrain, environment, wearing contact lenses, dry eyes. If you have pink eyes, you will have some symptoms such as itching, burning or stinging, discharge, swelling, watering. So you should take some measures to heal it. For example, you can put some ice on your eyes and change it frequently. And also, drop some eye drops, so it can relieve the symptom.