This can be due to some soft tissue injury or ligament injury. Start with tab zerodol sp twice a day, tab evion LC, physiotherapy as advised. Get evaluated by an orthopaedic surgeon.

• Contrast Fomentation (Hot and Cold). • Contrast bath---It is a form of treatment knee is applied warm water followed by the immediate application of the knee with ice water. This procedure is repeated several times, alternating hot and cold. Note that the treatment should always end in the ice water, as heat will induce the body's inflammatory response, while cold helps to decrease inflammation.

There may be chance of soft tissue injury. You need some rest and to see changes of pain.