I believe thats all it ever was. Madeleine may have had a small flash or mark but it is now clear this was enhanced by photoshopping for the campaign. The obvious hidden in plain sight, no mention of this on Madeleines passport proving how insignificant it was.
The McCanns and their family, Susan Healy in particular , a cold and unfeeling woman , has used her small grand daughter shamelessly, by mentioning how easy she would be recognised by her eye, knowing this to be untrue, has abused Madeleines memory.