Some hairs have a very short growth span, and that may be the cause of your relatively short hairs around the hair line. I notice that on either side of my forehead, I always have hairs that are only 2-4 inches long. I can neaten them by using a little gel to smooth them into the hairs nearby. You could try that. The short hairs around the nape of my neck I encourage to curl by twirling them around wet and slightly gelled fingers.
Bookmarks