Dark skin is not the curse.
I feel that you may be having tanning
effect due to sun rays.
Protect your skin by clothes and sun screen during day time.
Take orally vitamin C
,glutathion and nicotinic acid for long time.
Apply kojic acid
and vitamin C containing cream on pigmented skin.
Take bath with soap containing kojic acid.
You may be improved.
I hope you got my answer.
Dr. Ilyas Patel MD