Well, without a clinical evaluation it would be difficult to determine the cause of the lump. Possibilities that may need to be considered include lymph nodes, growths from structures in the neck or the surrounding connective tissue etc. Acute lumps are less likely to be cancerous. I would suggest getting this evaluated by a primary care physician initially and depending on the cause diagnosed or suspected, it can be managed accordingly or specialist care maybe sought.
Hope this is helpful.
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