Electrolysis is the only method to permanently remove all hair on an area, according to the United States Food and Drug Administration. Laser hair removal is an option to permanently reduce the amount of hair but doesn't remove all of it entirely, reports WebMD.
With electrolysis, a needle shocks the hair follicle so that hair no longer grows from it, and the process can be expensive due to the number of sessions, notes Fox News. Since several treatments are needed, this method is best for small areas. In addition, infection and scarring can occur from the procedure, warns the U.S. Food and Drug Administration.
Laser hair removal also requires several treatments and may require touchups later. It's not effective for lighter body hair, warns WebMD.