Medical Micro-needling is an extremely safe procedure. It is extremely effective because it both resurfaces and tightens the skin AND has long-lasting results. Down time is usually 1 day, although more than one treatment session may be needed.
Most skin rejuvenation options work by causing mild injury to the skin. The body immediately starts to repair the injury by replacing the injured skin with new skin. The injury has to be just serious enough to trigger healing, but not serious enough to permanently damage the skin.
Laser rejuvenation, chemical peels and other invasive methods are considered ablative, meaning they remove tissue to start collagen production in your skin. Lasers either remove the top layers of skin or remove only small parts / fractions of the skin (like a Fraxel or CO2 fractional laser). Learn more here: https://masterpieceskinrestoration.com/lip-rejuvenation/