Misshaded

He has arrayed Duessa in the radiant habit of "Heavenly Una with her milk-white lamb;" he has claimed for incarnations of revenge and guilt, that reverent affection which is due only to innocence and mercy; and over countenances, whose misshaded leprosy would look ghastly as the face of Death itself, has spread a veil of flimsiest sophistry, yet withal so artfully and curiously interwoven with gems and pearls of truth, that the eye of the spectator too seldom pierces the seductive disguise.

You can use the Eraser icon to erase a misshaded tank ( a factory reject, perhaps), and recopy or reflip the model.

For rendering purposes this problem can be ignored, with the result being one misshaded pixel once in a great while.