Hello Thanks for query .Based on what you have described the discoloration of your scrotal skin is due to what is called as Ballaniis Xerotica Obliterance (BXO). This is chronic Progressive inflammatory disease that involves skin of genitals and testicle which gradually spreads to penis.foreskin ,meatus and urethra . Unfortunately the etiology of this disease is still not known. This is a progressive chronic inflammatory skin disease of unknown etiology and considered to be variant of Lichen Sclerosis . This being a progressive disease the changes in colour of the skin and texture of the skin gradually changes and it becomes thick and hard. Use Vitamin E and Topical steroid cream .This will help to arrest or slows down the further progress of the disease process. Dr.Patil.