question: i went to puerto rico 6 months ago. I started coughing up little threads that resemble worms a week ago. my dr sent a specimen to a lab to be identified and gave me a script for albenza. my dr was sure i have a parasite. the lab results came in today and the specimen was classified as a fiber, not a parasite. i was also informed that my chest xray showed a spot on my lung. i ll be going for a ct scan monday. i m scared and i don t understand whats wrong with me. why would i be coughing up fibers that vary in color from clear-white to red-brown? do i have a parasite? should i keep taking the albenza? is it something worse? could this be a sign of cancer?