What I am seeing is not 'lens flare' it is 'fringing' - as doug has said it is caused by overexposure at that point. It occurs when there is an over exposed area next to a darker area in an image eg. shooting a tree against a bright sky you can often get a purple/blue fringe around the branches. It occurs most when there is a wide difference in the brightness and the exposure of the bright area is clipped by more than one stop. Most likely cause is voltage or light leak/bleed between individual sensor sites but manufacturers have spent a lot of money researching this and amending algorithms, sensor design to try and resolve the problem with so far only limited success. Difficult to do much about in this situation except to change the lighting.

And every one said, 'If we only live,
We too will go to sea in a Sieve,---
To the hills of the Chankly Bore!'
Far and few, far and few, Are the lands where the Jumblies live;
Their heads are green, and their hands are blue, And they went to sea in a Sieve.

Edward Lear
http://www.nonsenselit.org/Lear/ns/jumblies.html