Follow up required: If you have a knot which is not due to trauma, it can be cancerous(?sarcoma). But since you have just noticed this, it is too soon to tell which way it will go. Watch it for 1 to 2 weeks and check if it is increasing in size(ask you souse or friend to also put the fingers around and assess the current size. In case it increases in size over next 2 to 3 weeks, then you should go see your doctor.
Answered 11/25/2016
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