Derma roller on hairline are small handheld devices covered in hundreds of tiny needles. While they are commonly used in skincare routines for promoting collagen production and improving skin texture, they have recently gained popularity in promoting hair growth, particularly on the hairline. This technique is also referred to as microneedling. How Does a Derma … Đọc tiếp Derma Roller on Hairline: How It Can Boost Hair Growth