Thank you for the advise. I don't have any periods when I actively have blood in my sputum. It was only once, the first time when it occured and it lasted for 2 days on and off. The last time when I actually posted my concern the blood was only in the early morning until noon and it disappeared after this. I noticed that when it occured, i could have some blood in my sputum and then it is gone, but if I force myself with a very hard cough sometimes it would come back. It almost seems that the source is like a wound or something which when forced bleeds a little. This is only during episodes when the bleeding occurs though. If I force a hard cough at some other time no blood occurs. I guess the best decision will be to have a laringoscopy at some point. The first time when this occured i had 3 or 4 x-rays + 2 CT scans, one on my nose and one on my chest. I am not sure if another x-ray will show anything different but a brochoscopy should be helpful. I guess my main concern was that I have some kind of cancer at first but after all the scans that I had that didn't seem as a possibility. At least I hope it is not.
You should first have a careful exam of your nose and upper airways, by an ENT specialist, using a fiberoptic laryngoscope to see if a source of bleeding is in those upper airways. If not, you should have another chest x-ray and a bronchoscopy to look for a site of bleeding in the lower airways. It is possible that bleeding could arise from one of the 'cysts'. Ideally, the bronchoscopy should be done at a time when you are actively raising blood in your sputum.