What Causes Dryness And Peeling Of Skin On Legs?

Hi, I have giraffe like patterns on my legs and have had since I was a child. It is only on the bottom half of my legs and not on the inside of my calves. It is much darker than the rest of the skin and gets dry where by it starts to almost peel/crack from the edges. Please help!! Nothing I do works, I have used different creams, oils and body scrubs but it only makes the skin smooth without getting rid of the darker skin!