pulled chest muscle??

My husband is having sharp pain on his left anterior chest wall with movement, and with regular and deep inhailation. The area is slightly swollen but no brusing. He tells me it really hurts while trying to take a full breath. He recently was at work moving a rod iron part to an arbor, it was pressed against his chest (right over the heart) for a breif moment, when he heard a ripping sound.  I advised him to take ibuprofin and place an ice pack over the area. Tonight I wrapped the area with ace bandage and he is putting ice on the area for 10 min. at a time. We were wondering if this could be a pulled chest muscle, or strain? And if this does not sound like any of those injuries does anyone have any suggestions? Also any treatment methods that could help ease the discomfort. Thanks