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I went through your query and understood your concern.
Based on your findings and reports (the attachments were removed to protect the patient's identity), it appears benign and could be a soft-tissue growth. There is no need to worry. I suggest you do an ultrasound-guided biopsy or simple excisional biopsy and send it for histopathological examination. The histopathological report would give the nature of the lesion, whether it is benign or something else. Please attach a picture if possible.
I also have a few questions.
1. Is there any neck swelling or axillary lymph node enlargement on palpation?
2. Are there any systemic symptoms like weight loss, appetite decrease, evening rise of temperature, etc.?
Please reply to the above questions.
I hope this has helped you.
Thanks and regards.