Pink eye is an inflammation of the membrane on the front of the eye, an inflammation that is highly contagious.
Viruses, bacteria, allergens, and irritants like smog or chlorine from a swimming pool can cause pink eye.
You can prevent it from affecting your child and yourself by washing your hands thoroughly, and also avoid touching and rubbing your eye.
Most cases of pink eye heal on their own.
But, if you're in a lot of pain or have a weakened immune system, you should see a doctor.