Poor you stepping on your first egg.
What you have to do is wait for the iodine to work it can take 3-5 days or longer for the iodine to bring the bumble to the surface then you gently scrap the scab off with your nail. the plug may even come out with the scab if it's bumble or you may have to use sterile tweezers to pull it out. Hopefully it's just a splinter and you can find it and remove it.