How can I change the color of my skin?

Lately it has been looking very yellowish/ green.. I don't know if it's in my head or not.. and I haveint been sick lately.. what could it be.. and is there any vitimans I can take to fix it? anyone ever have this before... normally its just regular light cream and since I'm outdoorsy it's a little tan.. now I feel it looks gross.. what could it be.. my mom said maybe anemia
How can I change the color of my skin?
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