Green stuff sounds like pus. Make sure you continue to put antibiotic ointment on it like Neosporin or Bacitracin. If it gets really red, and hot and runny and you begin to run a fever go to the doctor. If you see red lines radiating out from it go to the ER. That might mean blood poisioning. I don't mean to scare you, but I want you to be safe.

Edited because I can't spell and used an offensive word by mistake.