Welcome to HCM.
Based on the information given by you i advice you to give rest to the affected knee, ice compression, and elevation of the knee will be helpful. Along with these some strengthening exercises and perhaps physical therapy
will be needed. In case of pain you can take over the counter pain killers.
I advice you to see orthopedician for examination if there is increase in symptoms.
Hope I have provided the information you needed.
Wish you good health. Take care.