Tight calves and poor ankle mobility do not cause varicose veins.
Varicose veins are caused by weakened valves in veins.
Veins
have one way valves where blood flows up your legs to your heart. When
the valves do not work properly blood can collect in your leg. Pressure
can build up.
I would recommend consulting a doctor to find out what is causing your varicose veins an prevent them from getting worse.
Are you seeing any improvements with your calves or ankle mobility?