Thanks for posting your query.
From description pain over left leg and groin area seems to be inflammatory in nature. Give rest to the part and avoid putting weight.You can take antiinflammatory drug like ibuprofen
to reduce pain . Get examined by your doctor to rule out any infective pathology.
Hope this will helps you. Feel free to ask me if you have any further queries.
Wish you good health. Take care.
Dr Saurabh Gupta.Orthopaedic Surgeon