Such nevus are only amenable to Q switched Nd YAG laser therapy. ​ Laser removal is a good option and is relatively painless. You must understand it requires multiple sessions, may be 6 or more to achieve a desired result. Each session can be performed at gap of 1-2 months depending on rate of clearance of pigment. Charges vary depending on laser machine used and should be around Rs 4000 /-for a single session. Hope it helps. The final outcome depends on a number of factors and may not achieve a completely flawless skin. Discuss all these points with treating dermatologist.