hi, this is about my nephew who has got facial sunburn. he had it since he was 13 years old. he is 15 now. the sunburn on his face looks real bad,looks so dark, that i fear that his facial skin will eventually in the long run turn bad. he moves bout in the sun, as he has no choice being in the tropics.is it something that has to do with his puberty,hormones,or thyroids. please help. thanks