They can be mineral deposits from your body (mine were caused by caffine) or something more serious; See you doctor. = Answer == They could be swollen lymph nodes. Lymph nodes are grouped together along lymph vessels throughout the body. There are a few places in the neck that have a cluster of these nodes. If you've been sick recently, then they are more than likely swollen lymph nodes. These nodes serve to filter out toxins and infection as these things circulate through the body. If a great deal of immune waste is filtered through one particular area, that area becomes congested with filtered material. This presents as lumps along a chain, because these nodes are along a lymph vessel pathway. These nodules will dissappear in time, no treatments needed. If you want to speed things up, you can look on the internet for lymph massage techniques, in which you can strip the congestion out by stroking the area in the direction of natural lymph flow. If you have not been sick lately, then it's important to get this looked at. There are other possibilities, but don't worry yourself...this is a very common finding.
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If you are worried about the lump on your neck then please go visit a doctor. A doctor will be able to help you much more than anyone here.