Is this just an open wound? Do you ever get any drainage from it?
I have seen this type of sore before, however I can't think of the technical term of it. But what you want to do is get this cream called Ichthammol. You can get this at your local pharmacy. If you can't find it, do ask your pharmacist, as they may hold it on their side. First wash the area with a mild soap, pat dry and apply cream. Cover with a band-aid. Do this 2x a day for about 3-4 days. This cream will actually draw out the seepage and heal the wound.
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This may have been a very deep infection for whatever reason. Itch can be a sign of healing, however with you stating intense, it shouldn't be like that. I'm glad the cream is helping some with the healing. I would continue it for now, especially since it's not getting worse. But since this is still there, I would highly suggest either following back up with your doctor, or better yet follow up with a dermatologist, as they may want to take a swab of the area, along with some skin swabs and have it analyzed at the lab, to see if there is some type of virus or bacteria in the wound area.
Worst case, you may actually have to have this area cut and cleaned open, especially before it could do further damage. I wish I were there to see this in person, to make sure. But with you having tried everything at this point, to be safe I would follow up to see what is causing this.
I don't know if the layer of skin/scab type is still falling off, but this can also indicate a process of healing. (picking or washing it off then can prolong the healing process) as it would be better to allow it to heal on it's own.
Hope this helps Hun