What Could Be Causing Persistent Scrotal Itching, Flaking, And Dryness?

Hi, My scrotum was itching since a month, when I itch it became flakes and dry, I have applied Sheund oil for 3 weeks, felt better for couple of days, but againt s itching, and the back side of the penis is also became dry and slightly whitish. Kindly suggest what to do