Microneedling is a cosmetic procedure that involves using small needles to prick the skin, stimulating the production of collagen and elastin. It can improve the appearance of scars, wrinkles, and large pores, and can also be used for general skin rejuvenation and typically requires multiple sessions for optimal results. It's important to note that microneedling may cause temporary redness and swelling, but downtime is usually minimal compared to more invasive procedures.