Hello Dr, my son is 11yrs old, he has white spots on the outer top parts of his ear for over 11 mths now, through summer and winter. He wears a sun hat and sunscreen all the time, the local doctor said it was frostbite, so I took him to a specialist and he said it wasn t and it wasn t a virus because he has had it too long. The skin specialist took a biopsy but the results were inconclusive but said it wasn t due to the sun either, he seems to think it might be an immune problem. We are waiting on blood tests, what do you think it might be?