Human skin contains multiple follicles for each hair. So in between follow-up sessions, dormant hair follicles often grow. That’s because our hair grows in cycles. As a result, most people need several electrolysis sessions for complete and permanent hair removal. The hair removal location determines the number of sessions required. It takes many longer treatments for larger areas like the legs. In addition, more sessions are needed for removing coarse hair, such as the bikini line.