This is likely to be a small lymph node which can enlarge due to various reasons like dandruff, skin irritation or inflammation, scalp infection, hair root infection etc (around the area). Usually this is a self limiting problem and lymph node lump subside on their own in about 10-14 days. The other possibilities of the diagnosis are;
All of these above are benign (non cancerous) phenomenon and are not a significant issue. You may confirm this with your primary care physician.
Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.
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