In the first 72 hours following injuring your forearms you can use the RICE regime, which is used to control inflammation and a form of pain relief.

R - Rest

I – Ice

C - Compression

E – Elevation

Rest from aggravating activity.

You should use ICE in the first 72 hours to control the inflammation.

You should apply the ICE for 15 to 20 minutes at a time.

Ice should not be applied directly to the skin, but through a towel or cloth, you can use a bag of frozen vegetables if you don't have any ICE on hand.

Compression can be achieved with an elastic bandage. which is a great tool to use.

Elevation is used to help swelling, another great tip.