Thanks for your question on Health Care Magic.
I can understand your concern.
Yes, external wounds if not treated properly, can lead to infection and sepsis.
So better to first get done proper surgical dressing of wounds.
And possibility of
chest injury unknowingly during fight is more.
And this blunt
chest trauma can cause
rib fracture,
pneumothorax, Pulmonary contusions and musculoskeletal injury. All these cause chest pain on deep breathing and yawning.
So get done chest x ray. If chest x ray is normal then no need to worry much.
Take painkiller and
muscle relaxant drugs. Avoid such fighting in future. Avoid heavyweight lifting and strenuous exercise.
Don't worry, you will be alright.
Get done chest x ray and surgical dressing of wounds.
Hope I have solved your query. Wish you good health. Thanks.