I bruised my knee three days ago. 48 hours after my injury, I continuously applied the injured area with ice. Today I went to the gym and cycled for 40 minutes, and I have a different sort of pain. The area feels very hot on the inside. From what I know, I am supposed to apply hot pack 48 hours after the initial injury. When I tried applying a hot pack, or some hot water, it feels like it is burning. Should I re-apply ice on the injured area for the next 48 hours again, or just apply hot pack anyways?