hello and welcome to HCM,
When you were given antibiotics, were you given any painkiller or antibiotic injections on your hip area? If yes then it could be an abscess
, immediately see a general surgeon
If you were not given any injections then the lump should be definitely inspected by a surgeon so that proper treatment can be given.
there is no direct relation between your ear infection
and the bruise
in the hip
Dr Sriram Nathan