Welcome To HealthcareMagic forum,
You have not mentioned the size of the nevus
and does the nevus have good hair growth over it.The little you have mentioned it seems to be a BECKERS NEVUS to me.It looks like a brown patch with excess hair growth over it.
You cannot go for any surgery on this ,but you can take a laser treatment
for it.Lasers requires multiple sessions to get a fair result .The final out come also depends upon your original skin type.In such cases we first remove the hair growth over the lesion ,and then go for removal of pigmentation.So,it means that we require two different laser machine to tackle this kind of nevus.I would advise you to consult a dermatologist
at your place who has good experience in lasers .