I am scared i hit my shin on the metal stairs of a school bus two weeks ago and now there is a tend bump and a vein showing, will they go away? when?

Bruise or hematoma: Bruises or a hematoma is when blood collects under the skin, outside a vein, from a trauma. Hematoma can feel spongy, rubbery. These take longer to heal than on face or arms..More than 2-3 weeks. Sometimes trauma on the leg can affect local circulation in the area with a resulting bulging vein that may go down in size but not go away. See vein doc: www.Phlebology.Org usually not dangerous.

Trauma & pressure: Trauma can cause inflammation of nearby structures putting pressure on the area insulted causing lumps and bumps. This is a normal response of the healing process after trauma. If uncomplicated overtime your lump and visible vein should disappear.