Hello I have studied your case Swelling around collar bone is very common condition and needs proper evaluation. Most common reason for supraclavicular swelling is usually infection, so we can start antibiotic regime and look for results. If there is no improvement then we will need to investigate in form of complete blood count,ESR,CRP,tuberculin test, and Fine needle aspiration cytology. If required CT scan can be done. There could be possibility of infection like Tuberculosis or sarcoidosis. If required later on you may need to do blood investigation for prognosis and recovery. Hope this answers your query. If you have additional questions or follow up queries then please do not hesitate in writing to us. I will be happy to answer your queries. Wishing you good health. Take care.