I have studied your case.
As per your age and history there is possibility of soft tissue injury
Most commonly meniscus
injury occurs may be associated collateral ligament injury
If pain persists then you may need to do MRI knee to see for any functional defect.
As per your symptoms you need to do physiotherapy
and knee exercises to improve range of motion.
Rest and ice fomentation along with supportive brace will help to reduce swelling and pain.
Small meniscus tear can be managed conservatively with physiotherapy with USG and TENS
Hope this answers your query. If you have additional questions or follow up queries then please do not hesitate in writing to us. I will be happy to answer your queries.
Wishing you good health.