Hi, thanks for writing to HCM.
Based on the description, I suspect it could be a soft tissue Hematoma
. If it is not resolving with conventional measures, it needs an evaluation to diagnose the swelling.
An xray is needed to know if the swelling is arising from the bone.
scan of the involved area to know the extent of the lesion as well as its contents.
Consult your treating doctor for a detailed workup and management .
Hope this information is helpful. Good day