Hello. Thanks for posting your query. It might be soft tissue injury or fracture at thumb. 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. Wishing you good health Regards. Dr Saurabh Gupta