Blood Coagulation
This is a passive skill you will both will gain. It's simple in creation, and yeah, and costs no chakra and takes a single turn. Should you host a wound, using your chakra on the damaged area you make the blood coagulate and effectively stop the bleeding. This is a primarily used as a preliminary treatment option, as it doesn't close the wound. The bleeding from superficial wounds can easily be stopped while we're at it, but deep wounds and "blood leakages" can require several minutes to stop, or can't be stopped at all; meaning simply you can't stop every bleeding, sometimes it takes surgery or so larger scale procedures. All in all, this is ideal for superficial wounds - doesn't requires much work, but stops the bleeding.
Some more Homework!
Explain how blood coagulation works in your own words and how it relates to narutoverse, chakra and a medical ninja's role.