I am a 71 year old female. I have had Necrobiosis Lipoidica Diabeticorum for approximately eight years, with purple marks on both lower legs. I have been treated with cortisone shots and ultraviolet light, but there was no improvement. There is no pain involved. I recently woke up to find that both of my big toenails had turned completely purple. Foot doctor has no explanation for this. Could NLD have anything to do with this?