<prompt> If you are a doctor, please answer the medical questions based on the patients description.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?  <response>: Respected user, hi I evaluated your query thoroughly. Not necessarily every fiber is parasite and every fiber is from cancer. Relax, there are lot many conditions of the lungs where you get certain fibers in coughing from inflammatory erosion of the bronchi alveolar margins, rarely certain tumors. So, dont get panic, no need to take further albendazole till CT Scan. Hope this helps you. Welcome for any further assistance. Thanks for using Chat Doctor s and giving me an opportunity to assist you. Wishing you fast recovery from the same. Regards dear take care. 