Hello and Welcome to HCM,
Thanks for writing to us.
It might be soft tissue injury
or fracture. It could be a scaphoid fracture
if there ii tenderness over scaphoid fossa.
Without X-ray, it is difficult to differentiate a fracture from others. I suggest you to consult an orthopaedician nearby for a detailed examination. You may get the X-ray of the area affected under his/her guidance.
In the interim,apply ice packs to the affected area,anti-inflammatory drug like motrin
to reduce pain and inflammation. Avoid lifting and rest well.
Hope this helps you.
Wishing you good health...
Dr Saurabh Gupta.