I Had Reaction After a Visit to the Dentist, I Got Swollen Cheek and Eye? (photo)

If only the side of the injection swelled up, then the most likely cause is that the needle inadvertedly hit a blood vessel and caused a hematoma (bruise).  If the swelling is on both sides of your face, then it could be an allergic reaction.

There is a main blood vessel under the eye that can cause this. It happened to me once but further back in the mouth. It is not the doctors fault, this can happen to anyone and there is no way to predict.

Something else that can cause this, is if you had a root canal treatment, the liquids used to clean the root can go out the tip of the root and cause this reaction.

You can take some anti-inflammatory meds such as 400 mg Ibuprofen and use moist heat to help reduce the swelling faster. Also, you may notice color changes such as blue, black, yellow, green, like a bruise. .

good luck

Dr. T

Yup...classic injection hematoma.  Your blood vessels were disturbed and damaged during your numbing shots.  It's not common, but happens to the best dentists in the world.  Managing these trauma is a headache.  Pressure and time is the best two medicines.  Antibiotics and pain management as needed.  Usually takes 2 weeks up to months to resolve depending on the severity of the vessel damage and how much blood has leaked.  Sorry that this has happened to you.  Very rare.

Thank you for your question. You mentioned that the dentist injected "in the upper right part". The picture shows a swelling under your LEFT eye. Assuming you meant to say upper left, most likely is was a reaction after injection by accidentally hitting a small vessel. It will go down and disappear within a short period of time.