My son of 6 years has itches in his eyes, he always scratches the eyes and after each scratches the eyes becomes red and dark around the eyes.
He may be having allergic conjunctivitis. He may also be allergic to something in the environment like dusts, pollen grains, fumes, soap, very cold or dry weather etc. Try washing his hands after playing or touching things around his surroundings. Please see an optometrist for proper evaluation