Painful lump is likely an inflamed lymph node there.
This is likely due to the viral infection.
Cold virus like adeno virus, corona virus can cause this commonly.
Another possibility can be a painful thyroid nodule.
Thyroid gland is located there and inflammation can cause painful lump --mostly benign.
However, i am not able to examine you online.
Hence, you should see your doctor for a clinical evaluation.
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