Hello, The swelling which you have been having at the site of impact might be a local accumulation of blood which has clotted and become hard (haematoma
). The tenderness might take a few days to go away. Nevertheless, as you have not been seen by a physician to confirm this, it is better to meet one, an x ray
might be needed to exclude slight pelvic fractures( though you do not seem to be having one assuming the fact that you are very ambulant). if it is a haematoma , just conservative treatment might be enough unless it is infected ,when it has to be evacuated. Hope you get better soon. take care!