Thanks for your query.
You didn't mention the cause for haematoma
and how was it diagnosed?
Haematoma is nothing but collection of blood.Incourse of time,it liquefies.It doesn't cause much pressure effects.
Nice to hear that your Colour doppler test is normal.
Please consult Orthopaedician and General surgeon
Ask them whether draining the collection will improve your condition .
Wish you good health