Thanks for writing your query.
It will be helpful if you mention the name of the medicines you are taking for blood pressure control.
Some medicines of blood pressure control having amlodipine
can cause swelling of the ankles as a side effect.
You should also get yourself investigated for following :-
3. Serum protein.
5. Urine examination.
You should keep your legs at a raised level while sitting or lying down.
If the problem persists, get yourself clinically examined and investigated.
I hope this is helpful to you.