why is there a lot of blood in my eye after chalazion removal? (Photo)

The medical term for the blood you see in your eye after chalazion removal is a subconjunctival hematoma.  Essentially, it is like bruising of your eyeball and can occur after surgery or trauma or sometimes even spontaneously.  This condition should resolve by itself over the course of several days.  If you do not see improvement in the next few days, you should contact your surgeon.  

It may have occurred from the anesthetic injection. It does not usually happen after chalazion surgery but some people bruise more than others. It will go away on its own in about 2 weeks. It should not effect the function or health of the eye.