I have pitted swelling in both legs, in the lower extremities, what could be causing this? i have high blood pressure.

Needs evaluation: Could be venous stasis, or a heart condition.

See below: Causes pitting edema in both legs:pregnancy, kidney disease, heart failure, chronic lung disease, thyroid disease, liver disease malnutrition, medication, such as corticosteroids or medicine for high blood pressure (hypertension) the contraceptive pill. One leg: a blood clot varicose veins, a growth or cyst. Rarely: being immobile for long periods hot weather, exposure to high altitudes, skin burns