These flares are pretty common. Probably caused by a bright flash or reflection overwhelming the CCD in the camera or a lens flare.
No Longer There
This one is unusual int hat there are two flares at right angles and the vertical one seems to have some very light pink numbers written over them. I can only make out the large 6 in the white part of the flare. You can see pinkish blurs to either side that may have been more numbers/letters.