Shiny/scaly rash on leg for months?

Hi, I’ve had this weird rash on my leg for months now. It started off smallish, but its got bigger and formed more little patches down my leg.

It itches occasionally, but its rare that it bothers me. Its kinda’ shiny, scaly, bumpy and crusty. Does anybody know what it could be and why it wont go away?

Thank you!