Im sure there are some people on here how will be able to give you a full detailed explaination, however im no expert with these things. I use this site alot i find it very helpful and they have alot of information of illness and disease in african clawed frogs and how to treat.

http://www.clawedfrogs.com/id20.html (illnesses)

http://www.clawedfrogs.com/id33.html (illness and disease)

hope it helps and i hope bibbit gets well soon.