my daughter who has an olive complexion, (she is 50% puerto rican, 25% italian and 25% irish) has small white spots on the upper part of her chest, just below her neck. They are small about the size of 1/2 a centimeter, but noticeable and embarassing to her...She is 11. She has always tanned every summer, I usually use SPF 8 or 15, but these spots are concerning me. Any idea what they are?