Re: Lump above collar bone. Should I be worried?
Swollen lymph nodes in the neck are common, but supraclavicular nodes (those above the collar bone) are sometimes treated with suspicion. Although a local infection can cause these nodes to swell disproportionately, this is the classic location for the presentation of Hodgkin's Disease. Lumps in this area should certainly be examined by a doctor.
To save on costs, go directly to an ears, nose and throat specialist (otolaryngologist) since this is their area of expertise, and it is possible that a general practioner would just refer you anyway. An initial consultation with an ENT should cost between $100-$200. If he thinks it is serious, he might send you to a surgeon for biopsy. It is possible that he might want to run blood tests first to rule out other common causes of swollen lymph nodes, such as Epstein-Barr virus.
Another alternative is to go to a hospital and ask for a chest x-ray. It won't necessarily tell you what the lump is, but lymphomas in the supraclavicular region have often spread from the mediastinal zone, and a radiograph should show whether there are any abnormalities in this region.
My advice is to go to see a doctor as soon as possible. Not necessarily because it is an emergency, but simply to put your mind at ease. There is no point waiting, even if it is not getting any bigger, since it will continue to prey on your thoughts. Treatments for Hodgkin's Disease are highly effective, and if it is in its early stages they have virtually a 100% success rate.