Is the area hot? Is the area discolored? That would be a warning sign to see a doctor. Otherwise, it could be just a pulled muscle. I believe the recommendation for a pulled muscle is alternating heat and ice.

http://www.mayoclinic.com/health/dee...CTION=symptoms
When deep vein thrombosis symptoms occur, they can include:

Swelling in the affected leg, including swelling in your ankle and foot.
Pain in your leg; this can include pain in your ankle and foot. The pain often starts in your calf and can feel like cramping or a charley horse.
Warmth over the affected area.
Changes in your skin color, such as turning pale, red or blue.