Thanks for writing in to us.
Lumps in neck region of less than three weeks' duration are most likely due to a self-limiting infection. As you are having this problem for 5 months, it needs proper investigation.
A meticulous clinical history with physical examination will usually provide a reasonable clinical diagnosis. Imaging is necessary for accurate diagnosis and assessment of the extent of a lesion's involvement prior to treatment. High-resolution ultrasound
is an ideal initial imaging investigation for most neck lumps.
Ultrasound features can be used to establish the diagnosis. This can be confirmed from ultrasound-guided FNAC, allowing appropriate clinical management and treatment.
Hope this helps