I have really itchy skin?

Im 22. I wash regularly twice a day with Dove soap but my back and legs are always itchy and my back in beginning to become dark because of all the scratching. It looks like I've been burned. I've used aveeno soap b4 unscented. It didn't work for me I was still itchy! I feel like I have chicken pots or something! Does any1 know what I can do???