What are blood clots and how do you know if you have them in your legs? do they look like bruises ? can you get them from bc pills

Blood clots legs: Deep venous thrombosis (DVT) are blood clots in the deep venous system of the legs, usually lower legs. Leg with DVT may be swollen, red, painful or there may be no symptoms at all. Risk factors include sitting/immobility for a long time, blood clotting disorder, pregnancy/birth control pills, smoking, being overweight, and many others. If you think you have dvt, go to emergency room right away.

Blood clots serious.: Deep venous thrombosis are a very serious condition especially above or near the knee. They may present with leg swelling and pain. A painless test, doppler / ultrasound, should be performed asap. Blood thinners may be needed to prevent further progression of the clots. Birth control pills, especially in smokers, increases the risk of this condition. If this is suspected see your doctor.