Hello and welcome to health care magic. Thanks for your query.
As per as your description it looks like a hematoma
following a strong impact on the head. i.e collection of blood underneath your skin.
You can try giving cold fermentation, take pain killer if it hurts. Usually it takes 2 to 3 weeks to resolve.
If it persists beyond this period , you may have to consult the doctor as there are chances that sometimes hematoma gets infected. In such cases you will have severe pain
Alarming signs for which you need to seek immediate medical help
are- loss of consciousness
, head ache, vomiting
, convulsions,bleeding from nose/ ears, weakness of any part of your body.
Wish you all the best
DR SHEEBA STEPHEN
( Emergency consultant