Hmm, the bumble looks smaller so thats good, I would try and pick away that black scab with your finger nail, and any excess dead tissue underneath it. Sometimes if you miss something in the pulling out of the plug, then the scab will stay black and take longer to heal. You are doing great, The swelling looks like its going down too, so these things just take time. After you pick off the scab, (it should just pull off like a human scab,) then make sure to fill any hole with neosporin and vetryicn. If there is excess gunk in the hole get that out too. It may be uncomfortable for the chicken in the process but it will be worth it! Good luck, Avery