Laser hair reduction should be performed after full hair growth has occurred following previous waxing to ensure maximum hair coverage in a session. The full length of the hair is not needed, but the full number of hairs is required for the best results in the minimum number of sessions.
Laser hair reduction targets the hair follicles and has no effect on healthy skin. If someone has active acne or other skin conditions like excessive dryness, some redness may be expected for a day. No long-term effects are seen.