I had come to the same conclusion MadCat but it was at its worse and I was being nagged by those cloest to me to 'sort it out' even though I am doing in shape of the diet - some people just dont understand!
On the other hand, a change of diet will often make you feel better about yourself in general, which may help if you are feeling down or depressed about P.
It is a bit impractical or expensive to use the cream forever (even if it works) – whereas, a new diet (if it clears you) can be a permanent lifestyle change for the better.
The only trouble of doing more than one thing at once is you never know which treatment is really clearing you and which one isn’t. I have got confused with something similar in the past (trying to 100% identifying my trigger foods) – I tried to test too many things at once and ended up thinking it was one thing, when it was actually something else.
Only you can decided what is best for you.
MC