Definatly ice it afterwards like everyone else above has stated. It could be just a repetive motion irritation. It also could be something similar to "Tennis Elbow". Very, very small minute tears in the tendon near the elbow or the musle fiber in your forearm. If it persists or gets worse, you may go see a doc just to have it checked out. Or you could try to have some massage thearapy done on your forearm and possibly your tricep to reduce the stress on your elbow joints. Just food for thought. Hope it gets better.
JM