Hello. Thanks for asking from HCM.
I can understand your concern. As the knot is present since childhood, most probably it is either bone moulding or scar or calcified
hematoma. No need to do anything for it.
But for pain and
injury which occurred 2 days back, you should
: apply
cold compresses at injury site to relieve pain and fresh swelling
: Keep your head at higher level than chest to relieve swelling
: take painkiller with anti inflammatory effects like
Diclofenac sodium after proper prescription
If still no relief, you should
consult doctor for collection/hematoma. Usually all symptoms subside in 7-10 days.
Do not worry about past swelling. Leave it as such.
Thanks. Take care. Hope it will help you.