Strange, I've been T1 (officially) for 3 months and developed something like this after the first 2 weeks. With a heightened awareness of potential foot problems I went to the docs and was put on a course of antibiotics. They didn't really know what it was but the AB's sorted it out and the swelling went away by the time I'd finished the course. Although front right shin feels tender a lot of the time.
Definitely go to the quack though, don't let it get worse.