My mother, aged around 45. Since yesterday morning, one side of her left eyeball started reddening. She does not have a sty nor is it conjunctivitis. So she splashed some water on both eyes and dropped 1 drop of Gulab jal on bith eyes. Is it necessary to see a doctor for this or just wait for it to heel while using some home remedies. She does not have any allergies either. Is it due to stress? Kindly provide remedies. Thanks in advance.