Please fellow nairalanders I need urgent help!!!

Let me be brief with what I'm about to say, I've benn having discoloration of skin for a while now from my knee to my ankle seems to be very fair in complexion while am a chocolate skin man, I've never used any toning cream, the only cream I've been using over the years is nivea nourishing cocoa but I still find my skin still the same.
Please I need help and solution or advice to this predicament thanks.