Sorry for late reply and inconvenience.
Thanks for all this additional information.
I understand your concern.
Well as you describe, it sounds like a sebaceous cyst.
Another possible cause may include a parotid gland lump.
An examination by a doctor needs to be taken.
You can now apply warm compress and start a multivitamin supplement and vitamin C lozenges.
Let me know if you have any further query so we can discuss it thoroughly in every aspect.
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