Because warts have blood vessels near their surface, they can bleed easily if injured or bumped.

What happens when your wart bleeds?

Q: Do common warts bleed? A: A common wart should not bleed unless it is scraped, scratched or injured in some way. If a wart bleeds without a clear cause or bleeds profusely after injury, it is important to consult a doctor without delay.

What happens if you tear off a wart?

Cutting the wart off won't cure the core infection (so the wart is likely to grow back anyway), and if you do it improperly you can make the situation much worse and greatly increase your risk of a painful infection.