Hello. I have a 12-year-old grandson who is typically rather dark-completed, and especially darkly-tanned in the summer. This week my wife noticed several round non-pigmented spots on his skin. His mother checked him last night and found he has these spots all over . My wife also pointed out that he has some gray hair (his hair is black). He has a dermatologist appointment tomorrow afternoon, and my wife is really frightened about the possible diagnoses she has found on the internet, what would be the more likely cause? Thank you. Francis.