Dear XXXXX, Thanks for providing quick additional information.
I am sorry for delay in reply and inconvenience. I'm so sorry to hear of your discomfort.
It can be a hamstring strain or a medial meniscal injury.
The meniscus is a rubbery, C-shaped disc which cushions your knee. Each knee has two menisci one at the outer edge of the knee and one at the inner edge.
You may have minor to moderate tear.
You may need MRI of affected part for precise diagnosis.
MRI can create better images of the soft tissues of your knee joint.
You may be advised to take help from physical therapist.
Local ultrasound, massage, range of motion & strengthening & stretching exercises, knee splint for a week could be helpful. Also Corticosteroid injections can be prescribed. At this time, an MRI is strongly suggested for clinical diagnosis.
I would suggest that you should not delay and urgently see your doctor for clinical evaluation and get it managed.
Please let me know how I can be of further assistance. My goal is to provide you with excellent service – if you feel you have gotten anything less, please reply back, I am happy to address follow-up questions.