Sierra, usually IBC symptoms would stay the same or get worse.  Fungal infections can be very hard to get rid of completely.  I know that when I've had one, I tend to stop using the cream when it gets better, and then the symptoms pop back up because I didn't use the treatment faithfully for the full prescribed time.  My husband has also had the problem of having skin issues misdiagnosed by his primary care doctor and later getting the correct diagnosis and treatment from a dermatologist.  Skin rashes are notoriously difficult to diagnose.  I really don't think you need to panic about IBC, but you do need to be sure you are using the right treatment in the right way for your discoloration.  You might want to see a dermatologist to be sure that the fungal infection diagnosis is correct.  And, of course, if you do develop swelling, redness and/or pain, go back to the doctor and ask for a more thorough diagnostic work-up.