What can cause continuos nosebleeds?

Prominent vessels. You may have some prominent blood vessels in the very front part of the septum. This region is easy to traumatize with nose picking/blowing nose, etc. If you are having frequent nose bleeds... Get it checked by your local ent.
Nasal blood vessel. You probably have a large superficial blood vessel inside your nose. You could also have a bleeding disorder or you may be taking a medicine that makes you more prone to bleeding, like aspirin, warfarin, plavix. Large prominent vessels are the most common. Keep the inside of your nose moist with saline and Vaseline. Try a humidifier. If that doesn't work, see an ENT specialist to evaluate.