Treatment varies with severity of angulation, Sometime the problem is muscular imbalance around hip and sometime it is accompanied by flat foot.
Some times the issue is there because of shape of bones.
Clamp shell exercise , Tray lift , Dead lift exercises are helpfull in such cases along with that stretching of inner thigh muscles with prolonged holds also improoves the situation.
Next Steps
Go for an x ray then meet a physio for posture evaluation and correction.
Health Tips
If flat foot is also there than insoles will help