I just discovered a hard lump behind my teenager daughters right ear. She said it does not hurt her. It doesn't move when you press it. Any one know anything. It has been there for about a week or two. No injuries recently but she did take antibiotics for flem in her throat three week ago.

It is impossible to say for sure what is going on. You should get your daughter into the doctor to be evaluated.
It could be cartilage or a cyst or even a tumor. I would get her in to be looked at just to rule out anything serious.

My daughter has the same lump. She also just took antibiotics for having fluid in both of her ears. I see it has been sometime since the post was made. What did you find out? My daughter has a doctors appt. tomorrow!