thanks to xoxolove! is it true that friction of the jeans to our knees make it dark? coz most of the i wear jeans, coz you know i dont have the confidence coz of dark knees. and whats the best way to apply lemon? i found lots of procedure in the net and i could not choose the best one.
And one thing more do you have any suggestion on how can i get rid from my dandruff?

i don't think your knees get dark from jeans. usually people with dark skin or medium tone skin get dark knees and elbows.

you should squeeze the juice from a lemon and mix it with an oil or moisturizer. i put lemon juice in rosewater and apply it. then i use any lotion on my skin.