I think Tom's advice is good. Look up Austwickia or Yellow Bumps here on the forum, there is a lot of info on it.Do you know anything about those spots?
The little scabs in your photo look like some of the other photos I have seen here. In a lot of other posts the tortoises are in significantly worse shape before dying though. It seems like they can live (suffer) with it for some time before dying in many cases. @mastershake knows a lot more about this.