Dear Elsie, The blood that you have mentioned in you left eye seems to be outside the eyeball but on the white of your eye. I am assuming this because you have no pain or vision related symptoms which is typical of blood inside the eye ball called Hyphema
. This small blood spot that you see might slightly enlarge in size and will slowly disappear in about 4 weeks. If it does not reccur there is nothing to worry about and no medication is required.