How to get rid of dark skin and itching around the leg?

A couple of ideas: The lower legs, around the ankle, are susceptible to skin problems because the skin is so thin and has a less than optimal blood supply. It gets drier and more easily irritated, and the veins may leak fluid and blood cells, causing a darker color--stasis dermatitis. But this would be uncommon at age 23. First you need to moisturize generously and then see a Dermatologist for a precise diagnosis.