Canesten - Thoughts if used please

Hi all I'm back trying Canesten (although really not fully convinced thrush is route cause of my issues). Going to try and persist for longer this time however. For those that have used my questions are two fold. One, should it sting? Two, do things look worse before getting better? The area applied has gone bright red and sore. Thanks in advance.

You need to post a photo or 2 clearly showing the current situation …