How do you get rid of a bruise in 24 hours?

After 24 hours, it's safe to apply heat to increase circulation to the bruise and to start to clear away the pooled blood. Try placing an electric heating pad, warm compress or hot water bottle on top of the area for 20 minutes several times a day.

How long should you ice to prevent bruising?

Ice the bruise with an ice pack wrapped in a towel. Leave it in place for 10 to 20 minutes. Repeat several times a day for a day or two as needed. Compress the bruised area if it is swelling, using an elastic bandage.