A typical bat bite looks like this:
People who were bitten said that it feels like a sharp needle jab. Therefore you can always notice it and feel it, although in some cases a bat bite can remain superficial. However, it is important to treat bat bites because they can be really dangerous as bats can carry diseases like rabies which could be transmitted to humans.
So, the best way to treat a bat bite would be to try to stop the bleeding, clean the wound and visit your doctor immediately in order to avoid any inconvenience, even if you think that the bat might not have rabies. Hope this helps!