___ pack can be applied on a bruise to reduce swelling.

Bruise:

1. A bruise is an injury in which the small blood vessels under the skin's surface break and a small number of blood leaks and collects under the skin.
2. The trapped blood causes a bruise and the skin remains intact and there is no external wound.

First aid for bruise:

1. To treat a bruise, apply an ice pack wrapped in a cloth immediately and elevate the injured area if possible.
2. The ice pack can be applied for about 10-15 minutes at a time and repeated after some time.
3. Ice pack helps in reducing the swelling and discoloration of the skin.
4. A bruise does not need a bandage.

Final answer: Ice packs can be applied to a bruise to reduce swelling.