What Causes Itching On Toes?

Hi, I have a question about my feet. On my third toe on each foot, I've got extremely itchy tops of them. This has occurred for more than 2 years now. They get pussy and bleed whenever itched. When I try really hard and not itch, they skin does repair, it remains red of top though. As I said, it's only the same two toes on the feet- it's not spread anywhere else. They're itchy year round, everyday, it also feels like there may be a build up under the skin. The toe feels firmer and it higher than the others if that makes sense. I use a cream, although it helps, it's not a long term solution. I saw a dermatologist who ruled out Tinea but only gave solutions such as a different cream etc.

Any ideas? I cant wear shows like thongs anymore, i'm too embarrased by the state of the toes. I would love to attach a photo, there doesn't appear to be a function though. Thanks, Lydia :)