AN's are easily removed with lasers, but they will return if there is an underlying problem causing them, such as PCOS or elevated blood sugars. SInce laser treatment can be expensive, I tried a product with beta hydroxy (neutrogena pore refining face cleanser). After a few days of treatment the rough part of the AN comes off, but a little pigmentation stays. See a doctor about your blood sugars and hormones, though, because AN's are an indicator for those problems, like I said.
i have this skin issue since i was little and it is in places that are imbarasing to reveal and are in places that always revealing. my mom recently found out what it is and how it can be curred. these are the websites that you can read about it: http://www.beautyassist.com/skin-disorders/acanthosis-nigricans.html
i hope this helps you