I hope this is the right place to put this.
I recently bought a EFS 17-55mm.
I was blowing dust off it with my rocket blower when i just happened to see a tiny black speck that was resistent to the blowing. On further inspection the thing was either inside or in front of the element. The black speck changes shape when looking from different angles, When i looked at the element from an oblique angle with a light shining through the lens it appears very bright.
Is this an air bubble (ignore all the dust and flare please...this was a fairly hard photo to take). The lesion is the white thing that lights up in different angles.
More importantly, will this affect image quality (don't see it on images), since its in the rear element. Should i ask Canon for a new lens? Its otherwise great.