I am 23 year old and my skin type is oily and nowadays my skin looks very dull and dark and facing the problem of open pores. I use a sunscreen of spf 40-50 before stepping out to the sun but still my face always looks like tanned. Can you suggest me a good quality skin care routine so I can improve the texture of my skin. There is no luster in my skin. I 've vitamin C serum for some but my face is looking much darker after using vitamin c serum.