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You should have it ultrasounded if it remains there for another 10 days.
It could be:
thyroid cyst, nodule, inflammation, etc
internal jugular thrombosis
thyroglossal duct cyst
infection such as ingrown hair
It could also be a cyst of any type such as a cystic hygroma, dermoid cyst, sebaceous etc.
This is to name a few common causes.
There are also several rarer causes.
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