That is usually an allergy. You might try cold compresses, and an over the counter allergy drop like Zaditor or Ophcon-A
You might also try rinsing your eyes thoroughly with bottle of sterile saline solution. You can find this in first aid supplies section or the contact lens care section of the pharmacy. Lean over the sink with your head turned sideways. Angle the bottle to gently rinse across the lower eye, holding the lid open if necessary. Rinse thoroughly, repeat on the other side. This may help get at least some of the allergen out of the area.