Electrolysis is a treatment where a small needle is inserted into each individual hair follicle, or the sac from which the hair grows (via Mayo Clinic). An electrical current runs through the needle and destroys the base of the follicle so that no hair can grow from it anymore. The process takes a long time and multiple treatments are usually needed since each follicle must be killed in order for it to be effective.

The process of getting electrolysis can be painful, since you have a weak electric current touching your skin (via University of Michigan). It can cause redness and swelling at the site where the follicles were damaged. Your skin may be tender for a while after treatment, but these side effects should all be temporary. Unfortunately, some people may have more serious problems like skin darkening or scarring at the treatment site. Keloid scars, which are caused by an overproduction of collagen, can also be a lasting side effect of electrolysis. They tend to be hard, tender, and can range in color from pink to dark brown. So if you're considering electrolysis, be sure to weigh the pros and cons of treatment with a professional before making your decision.