[header] How to stop a zit from bleeding [title] Apply hydrogen peroxide and direct pressure to encourage the blood to clot. [step] Soak a clean tissue or washcloth in hydrogen peroxide, then apply gentle but firm pressure to the bleeding zit. The pressure will encourage the blood to form a clot, while the hydrogen peroxide will kill any bacteria coming out of the zit. 
This will prevent your acne outbreak from spreading to the surrounding skin. [substeps] Note that hydrogen peroxide can dry out your skin, so make sure to moisturize once the bleeding has stopped.