I have these too....but it looks like a fiber inside of the worm. Using my magnifying glass, I've noticed that when said worms die, a fiber will emerge seeking to implant itself in another area of my skin. I have just discovered also, that there are these tiny little things sticking up from my forearms that actually "spit" out fibers! I made the mistake of pulling one off and suddenly my arm began humming painfully, nematode like things shot up my arm towards my hands and pierce my skin in my hands and fingertips! One point was almost as large as the tine of a fork! I have so many crazy symptoms with this damn stuff! Only someone with Morgellons would understand and not think me crazy!