my skin get dark as i roamed in sun for 10years,age:25 gender:male

My previous skin before 10 years was normal. but it changed now into oily. After i wash my face within ten mins my face will become dark.pls suggest some idea and tips. i dont have any bad habits. now i am working in a/c only.

checkout below link for skin care:

http://homeremediesforyou.com/skin-care