What it sounds like is "red leg", a bacterial infection and not chytridiomycosis. "Red leg" is a very contagious disease that can be lethal. It usually manifests itself in unsanitary conditions.
Chytridiomycosis manifest differently than "red leg". I had to deal with chytrid late last year with a fire salamander. The salamnder was lethargic, it stopped using its hide box (very unusual behavior for a salamander), and it stopped eating. More importantly it's skin began to fluff off, so when I handled it bits of black skin would be left all over my hands, and white patches also appeared on the skin.

So in conclusion, I believe your frogs did not have chytridomycosis, but had a bacterial infection commonly called "red leg". Here is a link for more info http://animal.discovery.com/guides/r...egdisease.html