Laser hair removal can disable hair in an active growth cycle on the day of your treatment. However, circumstances such as pregnancy or menopause or certain medications and hormonal conditions can trigger a dormant follicle to grow in. Dormant follicles are not active and therefore not able to be treated. The new growth, however, will be much lighter in color and considerably finer in texture because of the procedure. If this should happen, a touch-up treatment would be required.