As Dr Colin Theng has mentioned, your epidermal naevus is a harmless condition so any treatment will be for cosmetic improvement.
Surgical removal ie cutting it out will leave a rather large scar but will have the advantage of completely removing the naevus. I often treat these with the CO2 laser which burns off the brown areas that you can see, leaving a flat brown mark that will usually improve over time. From studies, the recurrence rate is approximately 30% at 18 months. Most patients (75-90%) are satisfied with the outcome after CO2 laser.
Hope this helps!
Warmest regards
Dr Stephanie Ho, Dermatologist