19 y/o female 110 lbsI, no significant medical bg. was hit in the chest with a blunt object right above my left breast about 1 week ago. Now when I breathe in too deeply, sneeze, cough, or move my left arm in a certain way, I feel discomfort/pain. The pain comes from sneezing. Also now there is quarter-size bump and the pain travels to my armpit/side area at certain times. When I press down on the bump I feel some pain. It is a hard bump but no bruising. When my chest got hit I felt winded. Thank you for any answers