Hye! Dark skin is not a disease.dark skinned people can live normal life. Color of skin depends on genes and enviorment. Nobody can change genes, but if you avoid sun exposure, the little improvement may occur. To be fair, you avoid worries, take kozic acid soap bath daily, use sunscreen, have healthy food. Take vitamin C
tablet twice a day , nicotinic acid tablet twice a day, glutathion containing tablet once a day for long time till you get good result. Remember, good result may not be permenant. But you continue to take care of your skin. You have selected biology, concentrate on your study to get good score, so that you can get admission in medical college. Best wishes.. Be a brilliant honest doctor. Ok..