I recently hit my foot where my vein is, it immediately started swelling and is now purple do i need medical attention?

Bruise: Most likely you tore the vein,causing blood to leak out leading to a hematoma, more often called a bruise.By now the bleeding stopped on its own and the tear in the vein is healing but it will take a week or two for your body to remove the leaked blood.Keep your foot elevated when at rest to speed healing, try taking Vit C 500-1000 mg 2-3x/day. Also try homeopathic Arnica 12c 2 pellets AM and PM.