Welcome to the forum.
It might be soft tissue injury
Without X-ray, it is difficult to differentiate a fracture from others. I suggest him to consult an orthopaedician nearby for a detailed examination. he may get the X-ray of the area affected under his/her guidance.
In the interim,take anti-inflammatory drug like motrin
to reduce pain and inflammation. Avoid putting weight and rest well.
I hope this information has been both informative and helpful for you.
You can consult me again directly through my profile http://www.healthcaremagic.com/doctors/dr-saurabh-gupta/64132
Dr Saurabh Gupta.