If you dreamed of blood anywhere, it is usually a bad dream.
If you had a dream about being beaten up badly, this is a warning of a threat. Some raw data in your waking life likely triggered this dream. If you faced antagonism in your waking life, your subconsciousness has processed this information and triggered this dream.
The dream imagery of being beaten up to the point of bleeding, is a warning of possible danger. You should prepare to protect yourself by removing yourself from harm.
