That should have started healing by now.. If you can post a pic it would help to how it is but I think its time for antibiotics. You are same state as Jehmco.com they sell maracyn 2 and nitrifurazone .. either are a good choice to try. You can also maracyn 2 on amazon.
Kanamycin is sold on Amazon as kanaplex also at lfs.
And seachems polyguard is another option found at lfs and amazon.