Have you seen a small roller or pen covered in tiny needles and wondered if it could help your thinning hair? Scalp microneedling gets a lot of attention online. But before you try it, it helps to know what it can—and cannot—do. What Is Scalp Microneedling? Microneedling uses tiny needles to make small openings in the scalp. The idea is that this may help the scalp respond to treatment. It may sound simple, but it is still a procedure that affects your skin. The tool, the dep