Hi,
Without a clinical examination, it is very difficult to say for sure what exactly is the "growth".
From your description, it seems to be either an enlarged submandibular gland, tonsil, or a lymph node.
Do you have any symptoms like fever, weight loss, or night sweats? Have you had sore throat recently? How large is the swelling? Is it soft or firm or hard? How long have you had this swelling? Is it increasing in size, or static? Is it tender to touch? How old are you? Have you been possibly exposed to mononucleosis or tuberculosis recently?
If you answer these questions and provide more details, it may be possible to make a guess about the likely cause. But as I said earlier, one cannot be sure without a physical examination and a few tests if necessary.
I wish you all the very best!
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