This is a type of birth mark called a "Becker's Nevus" and there are very little treatment options. we are having success using picosecond lasers for the color and laser hair removal for the hair. However, there is a chance with any lasers for rebound pigmentation or for the birth mark to recur. I suggest only seeing an expert in lasers such as a cosmetic dermatologic surgeon. Best, Dr. Emer.