How Can I Get Rid Of The Red And Purple Scars Left By Bruises?

I fell on holiday two weeks ago and badly bruised my legs, the bruises are fading but have left some small purple red marks with nasty blisters on them. I came home from holiday with a virus that caused me to become dehydrated this consequently caused my kidneys to go into failure and I ended up in intensive care for a week. I stablised and was put on a ward to recuperate prior to going home and this is when I noticed the blisters. I asked the staff about them and was told not to worry it was because I had been in bed for a week and that they would go but they have burst and become quite painful and some keep filling up again with a yellow liquid that stains a tissue clear when bursting. Do I need antibiotics as the nurses at the hospital seemed to think I was being fussy? Thank you