My Granddaughter Had Staph Drained In Hospital Sat 3-4 Days

my granddaughter had staph drained in hospital sat 3-4 days ago gotten smaller but now purple and it hurts to urinate she says she keeps stopping the stream due to pain. could this be staph spreading she said hurts to pee since she went to emergency room. is purple healing or getting worse for area drained? it itches her and still hurts she says but I think she said in general felt better. she is just 5 years old.