Hello, Thanks for choosing health care magic for posting your query. I have gone through your question in detail and I can understand what you are going through. A cyst in thyroid could be a benign cause. It may be needed to treat if it is cancerous or ig enough to cause compression. These days there is no need to do biopsy or removal, instead there are radioscans available which can detect if it is cancerous. Regarding the infection in your throat, you can do a throat swab to identify the exact causing organism and take the exact therapy which will be effective for that organism. Hope I am able to answer your concerns. If you have any further query, I would be glad to help you. In future if you wish to contact me directly, or want to further details about your query, you can use the below mentioned link: bit.ly/dr-srikanth-reddy Wish you good health, Kind regards Dr. Srikanth Reddy M.D.