you know its infected if it is red and swollen. usually by this time you'd have puss coming out of it also..... pain is also an indicator.
One, you can still clean it out on a daily basis - two put neosporin on it to kill the bacteria, three band-aids to prevent future infections.......
here is info from web md....
When you have a cut:
Stop the bleeding. For more information see how to stop bleeding.
Determine whether other tissues, such as blood vessels, nerves, tendons, ligaments, joints, bones, or internal organs, have been injured.
Determine whether evaluation and treatment by a health professional are needed.
Clean the wound and remove any dirt or debris to prevent infections, both bacterial skin infections and tetanus ("lockjaw").
Determine whether you need a tetanus shot.
Review the Emergencies and Check Your Symptoms sections to determine if and when you need to see a health professional.