There are the following possibilities for red bloodshot eyes: 1. The eyes are stimulated by trauma to the conjunctiva, and a conjunctival reaction occurs. 2. Corneal damage occurs, and at this time the patient may have red eyes with photophobia, tearing, and fear of opening the eyes. If the patient is not allergic to cephalosporin, he can take oral cephalexin. 3. If anterior chamber bleeding or traumatic pupil opening occurs, traumatic iritis occurs and rest is needed to limit activities. You can do iontophoresis with tobramycin and dexamethasone injection to reduce the reaction of traumatic iritis.