A day ago i extracted a blackhead from my nose. blood came out and the area is now bruised. how long until it goes away and will it leave a scar?

Be careful!: It is tempting to go after these - but you will often cause more damage. Bruising should heal over a few days. Put light layer of neosporin on opening. Picking zits over nose/forehead can cause irritation leading to an opening for infection Delicate part of your body and these can be severe in rare cases due to infection with MRSA. See your MD for a safer way to treat the acne with medications.